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Platydictya jungermannioides (Bridel) H. Crum [Hypnaceae]
map of distribution

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.

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 ·
LiteratureKellman 2003; Lawton 1971; Showers 1982.
IllustrationsMalcolm et al. 2009 p. 288; Flowers 1973; Ignatov et al. 1996; Ireland 1982; Lawton 1971; Ochyra 1998a; Smith 1978.
BioregionsCaR, CW, NW, SN, SNE.
VouchersFresno Co.: Redwood Creek, Windy Gulch Redwood Grove, Sequoia National Forest, Norris, Shevock, & York 87961 and Dinkey Lakes Trailhead, Sierra National Forest, York 1128 (CAS, UC); Inyo Co.: Little Lakes Creek near Long Lake, Norris 79013; Mono Co.: Lundy Lakes Trail, Inyo National Forest, Norris 78902; Santa Cruz Co.: Wilder Ranch State Park, Kellman 817 (CAS) and Santa Cruz City, Kellman 1093 (CAS); Shasta Co.: Squaw Valley Creek southwest of McCloud, Shasta-Trinity National Forest, Norris & Hillyard 104294; Siskiyou Co.: trail from Big Flat to Yellow Rose Mine, Norris 9124 and Salmon River near Big Flat, Norris 9168, Jaynes Creek northwest of Klamath River, Norris 48702; Tulare Co.: Kaweah River near Atwell Mills Campground west of Mineral King, Sequoia National Park, Norris 46451 & 46480 and Squirrel Creek off of County Road 372 about 1 mile below Oriole Lake, Shevock 17646.
   

Elevation by latitude plot for Platydictya jungermannioides
   in California

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