Platydictya jungermannioides |
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Jungermann's platydictya moss, thread-like willow-moss |
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Habit | Plants dense, soft, silky, green to yellow-brown. |
Stems | with branching angle narrow, branches easily detached; pseudoparaphyllia absent; rhizoids axillary, purplish and granular-papillose at least when young. |
Leaves | erect-spreading or sometimes ± secund, 0.1–0.3(–0.5) mm; base not or somewhat narrowed to insertion; margins serrulate, especially at insertion; alar cells subquadrate, region of 3–7 cells; distal laminal cells shortly oblong-rhomboid, 3–4:1. |
Seta | 0.6–1.1 cm. |
Sexual condition | dioicous; perichaetial leaf margins ciliate-dentate distally. |
Capsule | erect, oblong-cylindric, symmetric or nearly so, 0.5–1 mm, contracted below mouth and at neck when dry, neck short; stomata in neck; annulus 2-seriate; operculum convex-conic, stoutly mammillate to ± rostellate; exostome teeth whitish yellow; endostome cilia 1 or 2, rudimentary to well developed. |
Spores | 11–13 µm. |
Specialized | asexual reproduction by axillary obcuneate propagula. |
Platydictya jungermannioides |
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Habitat | Rock in damp, sheltered places, crevices of cliffs, under rock ledges, peaty soil, humus under overhanging turf, hollows under roots of trees, lower sides of logs, calcareous habitats |
Elevation | low to high elevations |
Distribution |
AK; AR; AZ; CA; CO; IA; ID; MI; MT; ND; NM; NY; VT; WA; WY; AB; BC; NB; NL; NS; NT; NU; ON; QC; SK; YT; Greenland; Europe; Asia
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Discussion | Platydictya jungermannioides is easily recognized by its small size, absent or almost absent leaf costa, easily detached branches, and axillary rhizoids that are purplish and granular-papillose at least when young. The branching and rhizoid characters differentiate P. jungermannioides from the other three species of Platydictya. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 28, p. 283. |
Parent taxa | Amblystegiaceae > Platydictya |
Sibling taxa | |
Synonyms | Hypnum jungermannioides, Amblystegiella sprucei |
Name authority | (Bridel) H. A. Crum: Michigan Bot. 3: 60. (1964) |
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