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Hypnum subimponens Lesquereux [Hypnaceae]
map of distribution
photo by Wilson of Coleman 1660drawing by Montalvo of Reeve 5iv64

Plants in dense mats, green to almost golden green, irregularly but rather densely branched with branches and stems little different. Leafy axes similar wet or dry, to 5 cm long. Leaves to 2.5 mm, 3–4: 1, falcate secund to almost circinate, lanceolate to ovate-lanceolate, gradually contracted from the non-auriculate base to the very long acumen. Margins plane, narrowly decurrent, serrate near apex. Median cells smooth, 4–7 µm wide, linear, up to 20: 1, thin walled, not pitted. Two or three cells of extreme alar region inflated and isodiametric, to 20 µm wide, accompanied by up to 6 quadrate but not inflated supra-alar cells with moderately thick but unpitted walls. Costa inconspicuous, short and double. Pseudoparaphyllia deltoid to orbicular, strongly overarching the bud. Axillary hairs 5-celled, to 250 µm with a very long basal brown cell, not offset from leaf insertion. Stem cross-section without a central strand, with a hyaloderm markedly enlarged and thin walled compared to the adjacent several layers of small and brownish pachydermous cells, and with inner cortical cells enlarged with thin and hyaline walls.
    Dioicous with male plants similar to females. Perichaetia in leaf axils, much shorter than the subtending leaves. Seta to 2.5 cm long, erect, pale yellow to yelloww. Capsule light brown, inclined to almost erect, arcuate, often strongly so, neither sulcate nor strangulate. Urn to 3 mm, about 3–4: 1. Exothecial cells near mouth of capsule isodiametric with thick walls and rounded lumens, to 15 µm wide. Exothecial cells at mid urn short rectangular, 1.5–3: 1, in regular rows, not collenchymatous, to 22 µm broad. Stomata phaneroporous, restricted to neck. Annulus present, not revoluble. Operculum conic, much shorter than urn. Exostome to 300 µm long, horizontally striate below, papillose above, light-brown. Endostome segments smooth to lightly papillose, perforate, about as long as exostome with basal membrane about 1/2 of total length. Cilia 2–3, nodose. Spores smooth to very lightly papillose, to 15 µm.

Mail a correction to Paul Wilson ·
LiteratureBourell 1981; Holmberg 1969; Jamieson 1969; Kellman 2003; Koch 1950a, 1951e; Koch and Ikenberry 1954; Lawton 1971; Lesquereux 1868; Spjut 1971; Toren 1977; Watson 1880; Yurky 1990, 1995.
IllustrationsMalcolm et al. 2009 p. 286; Lawton 1971.
BioregionsCW, NW, SN.
VouchersMarin Co.: Samuel P. Taylor Park, Wagner s.n. (UC); Mendocino Co.: Eel River about 3 miles south of Piercy, Norris 72143; Placer Co.: road to Bowman Lake about 2 miles north of Highway 20, Norris 77021; Santa Cruz Co.: South Fork Fall Creek, Henry Cowell Redwoods State Park, Kellman 358 (CAS); Siskiyou Co.: west branch of Sutcliffe Creek about 13 miles northwest of Happy Camp, Klamath National Forest, Norris 83299; Tulare Co.: Crystal Cave Road at junction with Little Deer Creek, Sequoia National Park, Shevock 15642.
   

Elevation by latitude plot for Hypnum subimponens
   in California

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