Incredible plants: tiger lilies

Lilium columbianum, near Comet Falls, Mt. Rainier
National Park, July 2016.

Lilies are a stunning group of flowering plants, and many members of that family have a strong aesthetic appeal for me. The Liliaceae are monocots, thus the flower parts occur in multiples of three. A prototypical lily flower would have six petals, six stamens, and a single style protruding from the center of the flower. Several lilies such as some members of Calochortus and Lilium have a curved perianth (petals), so that the overall shape of the flower is like an orb.

“Tiger lily” is an informal common name which has been applied to a few species in the genus Lilium that have orange spotted petals. These include Lilium columbianum (the “small-flowered tiger lily”), two subspecies of L. paradalinum (“Vollmer’s tiger lily” and “Wiggins’ lily”), and L.parvum (“Sierra tiger lily”) (Turner and Gustafson 2006; Skinner 2016). Other similar species in the Pacific states include L. bolanderi and L.occidentale, each with reddish spotted petals. 

Characteristics and distribution of five "tiger lily" species in the Pacific states.
References: Turner and Gustafson (2006), Baldwin et al. (2012), Wenk (2015).

Shoots of these lilies are typically 1-3 meters in height, green (non-woody), and have whorls of leaves emerging from the stem at regular intervals. The flowers of some species including L. columbianum and L. paradalinum hang pendant, a humble posture unnecessary for such a glorious flower.

Lilium pardalinum. Left: Ventana Wilderness, Los Padres National Forest, Big
Sur, CA, 2009. Right: Sucker Creek, Siskiyou National Forest, southern OR, July 2016.

Of the five species listed here, L. columbianum is most common, being distributed from British Columbia to northern California (Turner and Gustafson 2006). L. pardalinum occurs in California and southwest Oregon, while L. bolanderi and L. occidentale inhabit the Klamath mountains area in northwest CA and southwest OR (Turner and Gustafson 2002, Baldwin et al. 2012). L. parvum inhabits wetland or riparian areas at higher elevations in the Sierra range (Baldwin et al. 2012).

Lilium parvum, Tahoe National Forest, Sierra Nevada range,
CA, July 2009.

While visiting Oregon Caves National Monument earlier this summer, we camped along Sucker Creek, a quiet beautiful location where the shallow stream ran swiftly among rocks, close to the campsite. Riparian corridors seem to be excellent locations to find tiger lilies and I spotted some flowers along the far bank of the river. I crossed over to photograph them. The first flowers were somewhat on their way out, but farther upstream I found a cluster of several plants at the edge of the river near a rocky outcrop of serpentine, each bearing several flowers in their prime.

The green hues of serpentine rock and beautiful blooming lilies were exciting enough, but suddenly I also noticed a beautiful swallowtail butterfly visiting the flowers too. It was photographic bliss to have two such bright and magnificent organisms in the same place. The swallowtail was mostly undeterred by my close presence and spent some time visiting a few different flowers. It landed on the underside of each flower and then rhythmically bowed to the flower, each time inserting its long black proboscis deep into the flower to extract nectar.

Lilium pardalinum and a beautiful swallowtail visitor at Sucker
Creek, Siskiyou National Forest, southern OR, July 2016.

References

Baldwin BG et al. 2012. The Jepson Manual. Vascular Plants of California. 2^nd ed. University of California Press, Berkeley, CA.

Skinner MW. 2016. Lilium parvum, in Jepson Flora Project (eds.) Jepson eFora, http://ucjeps.berkeley.edu

Turner M, Gustafson P. 2006. Wildflowers of the Pacific Northwest. Timber Press, Portland, OR.

US Geological Survey. 1996. Kerby Peak, OR. 1:24000 topographic map.

Wenk E. 2015. Wildflowers of the High Sierra and John Muir Trail. Wilderness Press, Birmingham, AL.

Butte Lake, Lassen Volcanic National Park

View of Mt. Lassen from inside the crater of  Cinder Cone,
Aug 2016.

Except perhaps for Redwood National Park, I've been to Lassen more times than any park in the National Park System. Thursday the 25^th of August was the official one hundredth birthday of the NPS. Lassen too is celebrating its 100th birthday this year. But can a few trips alone do justice to any of the west’s marvelous parks? The weekend following the centennial birthday party, I visited a new corner of Lassen: the northeasterly Butte Lake.

Butte Lake lies east of Mt. Lassen, on the dryer side of the Cascades. The roads were dusty and pines dominated the landscape, a clue to the presence of a drier landscape on the eastern side of the park. The lake is at just over 6000 ft elevation and is presently sort of sickle shaped. It may have been larger at some point in the past. The southwest shore is comprised of heaps of jagged black lava rock that come right to the shore, part of the Fantastic Lava Beds. When this lava flow was deposited, it perhaps buried part of the more extensive lake. Only a few willows or other plants have been able to become established in the poorly developed soils among the dark unforgiving volcanic rubble.

Persicaria (left) and Sagittaria (right) in Butte Lake.

I kayaked around some of the northern end of the lake. Visibility wasn't great, and the water had a greenish hue probably due to plankton or other suspended particulates in the water. But it was refreshingly cool, which was very welcome given the dry and dusty surrounding landscape. Some of the shores supported tiny wetlands comprised of typical marsh plants such as Juncus (a rush) and Carex (a sedge). In the shallows at the edge of the lake there were also submerged aquatic plants, such as the floating Persicaria. A few of them displayed short spikes of pink flowers above the water surface. Intermixed, but in less abundance, were the floating arrowhead-shaped leaves of Sagittaria. At the tiny wetland near the boat launch, dragonflies and wasps were abundant. Water striders balanced on the surface tension of the water, distorting the surface and thereby leaving unusual shadows on the muddy bottom. 

To the south of Butte Lake, lies the conical Cinder Cone, one of the types of volcanoes contained in the park. It is a dark grey heap of barren gravel and rubble, set cleanly on the Lassen landscape like a pile of sugar dispensed from a heavenly hand. A hiking trail leads from Butte Lake to the east side of the mountain, rising quite steeply from the base up to the rim of the crater. Incredibly, a few trees have taken root on the outside of the cinder cone, where no real soil seems imaginable. A larger number of conifers can be found just inside the lip of the rim where water possibly collects and the wind may be less harsh. The base of the crater is perhaps a hundred meters below the rim, the interior shaped like a funnel inside the mountain.

The Milky Way, with a silhouette of Cinder Cone at bottom
center.

Saturday night after the darkening sky began to reveal an abundance of stars I ventured out to the rubble volcanic barrens next to the lake to photograph the sky. During about an hour and a half of photography, I noted some half dozen to a dozen shooting stars. The Milky Way spread in a luminous arc above, a wide ribbon stretching from south to north across the sky busy with so many stars.

References

US Geological Survey. 1995. Prospect Peak, CA. 1:24000 topographic map.

Lake Helen and Lassen Peak.

Shadow from a water strider on the bottom of Butte Lake.

Thornton Lakes, North Cascades National Park

The northern Cascades, looking south from the Thornton Lakes area.

2016 is the centennial year of the National Park Service, and with an annual pass in possession, I’m making some effort to visit parks wherever I can this year. Ideally, I’d have the luxury of a whole summer off to explore parks throughout the west, but such an extended vacation isn’t feasible.

I did have two weeks off to travel to the Pacific Northwest in July and the last wilderness stop I made was North Cascades National Park in northern Washington. It was a first time visit for me, as was Mt. Rainier in central Washington earlier that week. North Cascades encompasses two areas – a northern section of the park which extends to the Canadian border and a southern area bordered by two national forests and Lake Chelan National Recreation Area. Ross Lake National Recreation Area bisects the two park units, and is generally the gateway to the whole region. Almost all points of access to the National Park itself are by foot trail; in fact, there are only two dirt roads that lead anywhere directly into the park. Most of the park is also part of the Stephen Mather Wilderness.

The southern-most of the Thornton Lakes.

The terrain is rugged – forest, exposed rock at higher elevations, and many glaciers. The park has over 300 glaciers, a large fraction of all those found in the lower 48 states. Using aerial photography and measurements at several glaciers, researchers have been assessing their rates of change. Like other montane regions, the apparent effects of climate change are alarming: at North Cascades, total glacier area is estimated to have declined by about 40% since the mid 1800s.

I hiked into the park along the trail that leads to Thornton Lakes in the northern unit. The first 3 kilometers or so beyond the trailhead, there was little ascent as the trail went north and then south following the contour of a valley through mid-elevation forest. Thereafter it turned north again, but with significant elevation gain up the slope of the mountain. It was a challenging day hike, finally terminating on the eastern flank of a basin that held the southernmost of the lakes. From this relatively high vantage point, I could see the snow-capped peaks to the south, probably in the southern unit of the park.

The slopes of the lake basin were steep and a creek tumbled into the north end of the lake off in the distance. The trail down to the lake was likewise steep and I only went down partway, not reaching the lake. From the distance, however, I could see a constant stream of concentric ripples radiating out over the water’s surface. Perhaps fish were rising periodically to the surface to feed on insects.

Ripples on the lake.

One day hike of course was only a tiny sampling of this large and seemingly spectacular part of the Cascade Range. I look forward to another chance to hike or backpack into this rugged and remote wilderness.

References

National Park Service. Undated. North Cascades National Park map.

National Park Service, North Cascades National Park website.

Snow Lake, Mt. Rainier National Park

Snow lake, the southern end.

Alpine lakes are one of my favorite destinations in the mountain wildernesses of the Pacific states. At higher altitudes the water almost invariably reflects beautiful hues of blue, turquoise, yellow or some other color. The lake margins are usually lined with small wetlands or edge up against beautiful coniferous forests with tall spires of stately trees. Dragonflies and damselflies might dart to and fro while water striders balance on the surface tension of the water. In winter and spring ice blankets the lakes while they quietly sleep through the cold months.

After an evening hike to Comet Falls and a night of camping on the slopes of Mt. Rainier, the next day we set out to see a few other regions of the park. We stopped to see the meadows of lilies (and unexpectedly, the marmots!) at Paradise midday and then drove farther east into the park for a relatively short hike up to Snow Lake. Snow Lake is tucked into a basin at the base of a semi-circular rocky ridge that is part of the Tatoosh Range. The lake is sort of sickle-shaped. After a short jaunt beyond the end of the official trail, one reaches the southern end of the lake where brick orange soils stand out distinctly on the lake bottom.

Map of Mt. Rainier National Park at left (from NPS, 2015), and inset at right with
Snow Lake (from USGS, 1971).

Mt. Rainier from the Snow Lake trail as the sky clears after an early
summer storm.

For the first 24 hours of our visit to the park, Mt. Rainier was shrouded in clouds since a storm that had overtaken the Pacific Northwest that weekend in early July was still lingering. However, the clear skies of summer were returning and on the return hike from Snow Lake back to the trailhead, the clouds shrouding the mountain began to clear and the beaming rugged glaciers of Rainier’s south slopes became visible.

Mt. Rainier is the highest of all the Cascade peaks in Washington, Oregon and California, topping Mt. Shasta by a few hundred feet. Its magnificent slopes culminate in snowfields and cracked glaciers. It is a remarkable beacon in central Washington and I hope to visit again soon to explore all the gems it has to offer: rivers, forests, lakes, waterfalls, and ice!

Reference

Turner M, Gustafson P. 2006. Wildflowers of the Pacific Northwest. Timber Press, Portland, OR. 

Snow and ice on the southeastern slope of Mt. Rainier. 

White torches of blooming bear grass, Xerophyllum tenax
(Liliaceae).

White rhododendron (Rhododendron albiflorum) at left and avalanche lily
(Erythronium montanum) at right.

Comet Falls, Mt. Rainier National Park

Last week was my first visit to Mt. Rainier National Park in central Washington. The peak at the center of the park is the highest mountain in the Cascade Range, rising above 14,000 ft. The park boasts lush temperate rainforest and wide river washes fed by rain and glaciers crowning the mountain.

Vine maple, Acer circinatum, the foliage of which is just delightful in the fall.

Waterfalls dot the Rainier map and we headed towards Comet Falls on the southern slope of the mountain the afternoon we arrived at the park. A short distance from the trailhead, the trail passes over one of the tributaries of the Nisqually River that eventually runs into the Nisqually Delta near Olympia. The creek water rushed through a narrow channel of bedrock in a precipitous drop through a small valley making its way down the mountain. After crossing via foot bridge, the trail runs along the eastside of the creek up the slopes of Rainier. The water’s roar was a companion during the hike.

Flowers increased in number and variety gaining elevation up the trail. Among the most common were white six-petaled blooms of Clintonia uniflora, the flowers emerging not far above the ground next to a pair of smooth spatulate leaves (not unlike commercial orchids). Another frequent small ground cover species with white blooms was Cornus unalaschkensis (a small relative of the much larger tree, the dogwood). Yellow asters which I did not observe closely enough to attempt to identify were also common.

Blooms of Cornus unalaschkensis (left) and Clintonia uniflora (right), both common near Comet Falls.

Near Comet Falls there was a small population of the striking avalanche lily, Erythronium montanum, which I would later see in greater abundance in the higher elevation meadows at Paradise farther up the slopes Mt. Rainier. The flowers of this species hang down towards the ground, having six somewhat dishelved white petals that radiate out from a bright yellow center. Paradise also had many individuals of another species of fawn lily, E. grandiflorum (the Glacier lily), similar to the avalanche lily in habit, but with solid yellow flowers. E. montanum is distributed in the Pacific Northwest while E. grandiflorum occurs from British Columbia to California and into the Rocky Mountain west.

Avalanche lily.

Comet Falls.

There were a few Columbia tiger lilies along the trail too. Other booming species were numerous and included Maianthemum racemosum (large false Solomon's seal), Rubus parviflorus (thimbleberry), Rubus spectabilis (salmonberry), Rubus lasiococcus (dwarf bramble), Corallorhiza mertensiana (western coralroot), Phyllodoce empetriformis (pink mountain heather), Dodecatheon sp. (shooting star), and the striking red and yellow ornate flowers of Aquilegia formosa (columbine). The day was damp and cloudy, otherwise resembling conditions I would expect in late winter or fall, except that the presence of flowers and resplendent foliage reminded one that it was indeed summer.

Coralroot (Orchidaceae).

The rainforest at the base of Mt. Rainier is truly lush - one of the greenest forests I've been able to visit. As with most forests in the western Pacific Northwest's, massive conifers dominate the canopy. Cedars and firs were common in the park, and I also noted western hemlock, mountain hemlock, and Douglas fir. The new growth of needles on the tips of the conifer branches was everywhere, the bright green centimeters of vibrant new growth giving accent to the deeper evergreen of the older growth, such a pleasant sight! Lichens hung from the trees in abundance, giving the landscape a depth of age too.

After hiking to Comet Falls, we camped that evening among the beautiful conifers and had one more day to explore Mt. Rainier. The short trip did not give the extensive park due justice of course, but it was enough time to gain a taste for its beauty and to be enticed to return again.

References

Baldwin et al. 2012. The Jepson Manual. Higher Plants of California. 2^nd edition. University of California Press, Berkeley, CA.

Turner M, Gustafson P. 2006. Wildflowers of the Pacific Northwest. Timber Press, Portland, OR.

New growth on a small fir tree.

Oregon caves

Valley leading up to Oregon Caves
National Monument.

The Oregon Caves National Monument lies in the Siskiyou range, a mountainous region in southwest Oregon rich in biodiversity.

Dozens of chambers and tunnels connect the caves in a complex underground maze discovered by Elijah Davidson in 1874 while in pursuit of his dog and a bear that had entered the cave. The caves became a popular attraction; today the National Park Service leads tours of a little over an hour through much of the cave complex.

"Drapery" formed by sheet flow of water though
the cave.

The caves formed over the course of thousands of years as weak carbonic acid slowly dissolved the marble rocks underlying the mountain. The acids formed from the interaction of water with carbon dioxide released from decaying plant matter in the soils overlying the bedrock. The caverns and tunnels vary in size and shape. A very small stream (named the “River Styx”) runs through a part of the cave complex.

Slow mineral deposition over time as water continues to move through the caves has resulted in a variety of interesting forms inside many of the rooms. Dripping water creates forms such as stalagmites and the thin “soda straws” that project from some of the cave ceilings. Flowing sheets of water over rock surfaces form other shapes such as “drapery”. Lights set up by the Park Service help illuminate many of the features for visitors. 

Other cave features: stalagmites, stalactites, and
columns (fused stalagmites + stalagtites).

Drapery is most ornate in the "Paradise Lost" room,
my favorite place along the tour route.

Other reference

National Park Service educational materials

Crescent City rocky intertidal

The northern-most significant stretch of rocky coastline in California borders the small sleepy town of Crescent City. Last week offered some excellent early morning low tides, so of course part of the Pacific Northwest vacation needed to be scheduled around a few coastal adventures.

Pebble Beach area, Crescent City, exposed at low tide.

The Crescent City coastline consists of a long stretch of boulders (small and large) punctuated with offshore rocks and seastacks. At low tide the intertidal life is rich, especially abundant with red seaweeds. One of the species occurring distinctively here is the small peltate red alga Constantinea simplex. It grows in the low intertidal, mushroom-shaped, along vertical rock faces.

Every visit to the intertidal reveals some treasures - often new species or observations. Some highlights from this low tide excursion:

- a bright orange sea cucumber, unknown species

- a low intertidal pool with a long orange nemerteam worm, some bashful large sculpins, and little orange cup corals (Ballanophyllia elegans)

- abundant Desmarestia munda

- yellow dorid nudibranchs and a few other species

The early morning tide was quite low and the wind and sea were calm - perfect conditions for exploring the low intertidal.

A gray-blue species of sculpin in a shaded shallow intertidal pool.

The orange cup coral, Balanophyllia elegans.

Dermasterias imbricata.

Unidentified sea cucumber.

Oregon redwoods

According to the fossil record, redwoods once occupied a large expanse of territory across North America. Today they are restricted to a narrow coastal band along the Pacific coast where year-round temperatures are mild.

The modern day range of Sequoia sempervirens stretches from Big Sur in Monterey County, California to just across the California-Oregon border. At the southern end of the range, the trees tend to be shorter, tucked away inside steep valleys cut into the Big Sur coastline. They may survive courtesy of tongues of fog that roll in from the cool Pacific into the coastal valleys, while finding the dryer warm hillsides too inhospitable. Towards the northern end of the range in Humboldt and Del Norte counties, the redwoods reach their most favorable conditions, at least as evidenced by the size of the trees. In Tall Trees Grove in Redwood National Park in northern California, for example, several contenders for the world's tallest tree thrive near Redwood Creek.

Though I have spent much time among the redwoods throughout much of their range, until this week I had never seen the northernmost trees in the southwest corner of Oregon. The occasion was the first leg of a Pacific Northwest vacation in northwestern California and southeast Oregon. After an early morning exploration of rocky tidepools in Crescent City, I thought it would be an opportune time to make a detour to find the redwoods before heading to Oregon Caves National Monument (hopefully more on these adventures in later posts).

After crossing into Oregon heading north on US101, one heads east to follow the course of the Winchuck River for a few miles and then turns off onto a narrow one-lane road that winds into the western reaches of the Rogue River Siskiyou National Forest. About 2-2.5 miles into the road, the distinctive clusters of redwoods begin to appear among other conifers and at 4 miles the road ends and the Oregon redwood trail begins.

Redwood sorrel and wild ginger.

Maianthemum sp. 

The old growth forest hosts the typical consortium of understory species in Sequoia forests: carpets of redwood sorrel, tufts of sword ferns, and rhododendrons. I also observed huckleberry bushes, wild ginger, and a few orange tiger lilies.

Reference

Turner M, Gustafson P. 2006. Wildflowers of the Pacific Northwest. Timber Press, Portland, OR.

Granite Chief Wilderness

Lake and stream in the Granite Chief Wilderness.

The Granite Chief is the northern-most wilderness of the high Sierra, located west of Lake Tahoe and north of Desolation Wilderness. Up to about 7000 feet, most of the snow in this part of the Sierra has now melted. However, at in the Five Lakes basin to which I hiked last weekend (about 7000 ft elevation), most of the ground was still covered with snow, hardened presumably by repeated melting and refreezing. The firm ground made for easy hiking, though once up in the vicinity of the lakes, I lost much sense of where the existing trails were supposed to be.

The lakes were mostly frozen, but thawing. At the third lake I arrived at a thin transparent sheet of ice like glass was just receding from the edge of the shore. Water flowed out of this lake and fed an active stream that rumbled through naked deciduous trees down into a valley.

Phlox, Granite Chief Wilderness.

Without discernible trails, I didn’t venture far into the wilderness, but did hike up a ridge of exposed granite boulders that overlooked the lake basin. Here little carpets of Phlox were abundant. The flowers amass in dense aggregations of white to pinkish 5-lobed disks, each corolla of petals fused towards the base, protecting a few partly recessed bright orange stamens. There were also orange-red paintbrushes and yellow stalks of wallflowers blooming too, but Phlox was most abundant.

I made an effort to identify the common conifer species in the area; learning the diverse conifer flora of the western US is one of my long-term goals. By far, pines and firs dominated the landscape. I felt moderately confident identifying western white pine (Pinus monticola), lodgepole pine (Pinus contorta), California white fir (Abies concolor), and red fir (Abies magnifica). However, distinguishing the fir species was sometimes a challenge, particularly when the trees were small. I also found a mountain hemlock (Tsuga mertensiana; this species is common in the Three Sisters Wilderness of Oregon) and a lone gnarly Sierra juniper (Juniperus grandis), an old sentinel on the granite ridge overlooking the lake.

Juniperus grandis.

Reference

Kauffmann ME. 2013. Conifers of the Pacific Slope. Backcountry Press, Kneeland, CA.

Yosemite IV: Glacier Point

Looking southwest into Tenaya Canyon
with Yosemite Valley in the distance.

I took a quick weekend trip to Yosemite this month. The waterfalls were full; the new foliage on hardwood trees was bursting forth like lime green jewels. There were two new destinations on this trip for me: a hike into Yosemite wilderness on the northwest wall of Tenaya Canyon and a drive to Glacier Point on the southern rim of Yosemite Valley. Both afforded incredible views of Half Dome, Tenaya Canyon, Yosemite falls, and the other gems lying at the heart of the park.

From atop Glacier Point it was easy to see how crowded and developed Yosemite Valley has become. Meadows, forests and the sinuous Merced River still occupy most of the valley floor, but the roads and clusters of cars are in plain view from above. John Muir described the view as follows: “From Glacier Point you look down 3000 feet over the edge of its sheer face into the meadows and groves and innumerable yellow pine spires, with the meandering river sparkling and spangling through the midst of them. Across the Valley a great telling view is presented of the Royal Arches, North Dome, Indian Canyon, Three Brothers and El Capitan, with the dome-paved basin of Yosemite Creek and Mount Hoffman in the background. To the eastward, the Half Dome close beside you looking higher and more wonderful than ever; southeastward the Starr King, girdled with silver firs, and the spacious garden-like basin of the Illilouette and its deeply sculptured fountain peaks, called ‘The Merced Group’; and beyond all, marshaled along the eastern horizon, the icy summits on the axis of the range and broad swaths of forest growing on ancient moraines, while the Nevada, Vernal and Yosemite Falls are not only full in sight but are distinctly heard as if one were standing beside them in their spray.” – The Yosemite, 1912. 

View from Glacier Point. Tenaya Canyon entering Yosemite Valley in the foreground. Half Dome to the right.

Left: Vernal Falls. Right: Yosemite Falls.

Mill Creek at Big Sur

Macrocystis pyrifera (giant kelp) growing in a shallow pool in the intertidal.

Big Sur is one of my favorite places along the northeastern Pacific coast. Here the Santa Lucia Range presses against the Pacific coast, forming rugged rocky shoreline next to steeply cut valleys filled with redwoods and hillside slopes of chaparral and grassland.  

Much of the area is designated as California State Parks or National Forest (including wilderness) land. Big Sur has the usual California problems of invasive species, but the area has historically endured relatively little development. Tourists stream in along Highway 1 (in seemingly greater volume), particularly from the Monterey Peninsula, but much of the shoreline and coast range is too rugged for heavy human use.

I have a few favorite intertidal locations in Big Sur that I’ve visited intermittently over the years to tidepool, photograph marine life, or just collect seaweeds. Actually, quite a bit of the coastline is relatively inaccessible because of its steep topography, or for other reasons. For this month’s early morning spring tides, I visited Mill Creek on the southern Big Sur coast. Because of the early morning tide, I camped Sunday night at Plaskett Creek, and then Monday morning was lucky to have Mill Creek’s rocky stretch of coastline to myself.

Sea stars at Mill Creek, including Henricia leviuscula (center) and two examples of what may be
Leptasterias, a species complex of 6-armed Pacific coast stars. 

Desmarestia munda, acid (!) "kelp".

Excellent low tides notwithstanding, large swells offshore can keep the low intertidal relatively inaccessible for those wishing to stay relatively dry, but one solution to this is to don a wetsuit, at least up to one’s stomach, and make way into the low intertidal and the deeper intertidal pools. With some decent off-shore waves, this trip benefited from that method and I was able to access the deeper pools and photograph quite a few marine treasures with my underwater camera.

Mill Creek has a good mix of seaweeds (large brown seaweeds, foliose and finely-branched red algae, and some green algal species), seagrass (Phyllospadix) and invertebrates (anemones, seastars, mussels, etc.) – an example of a high diversity, less disturbed stretch of central California coastline. The substrate here is a field of large boulders, a cobble beach, and larger bedrocks with areas of coarse sand. The boulders tend to be rather large and are covered generously with algae and invertebrates.

Small seastars were common this month. Many were the whitish Leptasterias spp. (a six armed star typically a few cm across), but some were also juveniles of larger species. These new recruits perhaps represent local evidence of the reported rebound in sea star populations after the wasting disease phenomenon that led to a crash in west coast sea star populations in the last couple years.

Brightly-colored nudibranchs were also abundant and I spent some time photographing these beautiful animals underwater in the shallow pools. I observed at least 5 to 6 species including Okenia rosacea, which has seemed pretty abundant across the central to northern California coast over the last year. Yellow dorids were the most common on this trip ato Mill Creek. 

Two Mill Creek nudibranchs. Left: Triopha catalinae. Right: Dendrodoris fulva or Doriopsilla albopunctata.

Hermissenda crassicornis on articulated red coralline algae.

References

Behrens DW. 1991. Pacific Coast Nudibranchs. Sea Challengers, Monterey, CA.

Morris RH, Abbott DP, Haderlie EC. 1980. Intertidal Invertebrates of California. Stanford University Press, Standford, CA.

Incredible plants: Pleurophycus gardneri

Pleurophycus gardneri sporophyte with Laminaria
setchellii and other seaweeds on low intertidal rocks
at Glass Beach, Fort Bragg, CA, April 2016.

I came across a rare treat tidepooling earlier this month at Glass Beach in Mendocino County – Pleurophycus gardneri!

Pleurophycus is a moderately-sized kelp, consisting of a single photosynthetic blade at the end of a stipe than can be up to a half meter long (Abbott and Hollenberg 1976). Like other kelps, it is attached to the rocks with a holdfast, a structure that resembles roots. Pleurophycus lacks branches or the pneumatocysts (floats) that are present in some other kelp species. Its distinguishing feature for identification in the field is the presence of a wide midrib on the blade with a ruffled blade surface immediately next to each edge of the midrib. The species is perennial and deciduous with blades dying back each year (Germann 1986, Lindeberg & Lindstrom 2010).

The species is distributed from central California into Alaska (Silva 2009) but in my experience it is uncommon in California, particularly in the intertidal zone where I stumbled across a single individual in a narrow channel.

Western phycologists first collected the species from San Juan and Whidbey Islands in Washington state and from Alaska in the late 1890s (Silva 2009). Setchell and Gardner (1925) described its distribution from Alaska to Coos Bay, Oregon. Decades later a large population was found in the low intertidal at Ft. Bragg (Kjeldsen 1972) and the species was later discovered to occur subtidally off of San Luis Obispo County and Big Sur (Silva 2009).

For me, finds like this make an early morning rise to catch the spring low tides well worth it. In fact, though I am not naturally a morning person, I can’t say I ever regret a 4 or 5 AM wake up for a low tide adventure along the coast. During intertidal exploration I often find something new, but even when I do not, my curiosity and love of natural history is re-invigorated by the cool salty air and the beauty and complexity of the rocky shores of the Pacific.

References

Abbott IA, Hollenberg GJ. 1976. Marine Algae of California. Stanford University Press, Stanford, CA.

Germann I. 1986. Growth phenology of Pleurophycus gardneri (Phaeophyceae, Laminariales), a deciduous kelp of the northeast Pacific. Canadian J Botany 64:2538-2547.

Kjeldsen CK. 1972. Pleurophycis gardneri Setchell & Saunders, a new alga for northern California. Madroño 21:416.

Lindeberg MR, Lindstrom SC. 2010. Field Guide to Seaweeds ofAlaska. Alaska Sea Grant College Program, Univ. Alaska, Fairbanks.

Setchell WA, Gardner NL. 1925. The Marine Algae of the Pacific Coast of North America. Part III Melanophyceae. UC Publications in Botany 8:383-898.

Silva PC. 2009. Historical, nomenclatural, and distributional notes on two Pacific coast kelps: Lessoniopsis littoralis and Pleurophycus gardneri (Phaeophyceae, Laminariales, Alariaceae). Madroño 56:112-117.