Platydictya jungermannioides |
Platydictya subtilis |
|
---|---|---|
Jungermann's platydictya moss, thread-like willow-moss |
platydictya moss |
|
Habit | Plants dense, soft, silky, green to yellow-brown. | Plants dense, green to brownish. |
Stems | with branching angle narrow, branches easily detached; pseudoparaphyllia absent; rhizoids axillary, purplish and granular-papillose at least when young. |
with branching angle wide, branches firmly attached; pseudoparaphyllia foliose; rhizoids below or at abaxial leaf insertion, red-brown, smooth. |
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. |
erect-spreading, often subsecund, 0.2–0.5 mm; base somewhat narrowed to insertion; margins entire or nearly so; alar cells subquadrate, region of 6–8+ cells; distal laminal cells oblong-rhomboid, (2–)3–5:1. |
Seta | 0.6–1.1 cm. |
0.7–1.2 cm. |
Sexual condition | dioicous; perichaetial leaf margins ciliate-dentate distally. |
autoicous; perichaetial leaf margins entire. |
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. |
erect or nearly so, oblong-cylindric, symmetric, 1–1.5 mm, somewhat contracted at neck and sometimes below mouth when dry, neck short; stomata in neck; annulus 1-seriate; operculum conic, obliquely short-pointed to rostellate; exostome teeth yellow-brown; endostome cilia 1 or 2, rudimentary or absent. |
Spores | 11–13 µm. |
9–13 µm. |
Specialized | asexual reproduction by axillary obcuneate propagula. |
asexual reproduction absent. |
Platydictya jungermannioides |
Platydictya subtilis |
|
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 | Bark at base of hardwoods, exposed roots, logs |
Elevation | low to high elevations | low to moderate 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
|
AR; AZ; IN; MA; ME; MI; MO; NC; NH; NJ; NY; OK; VA; VT; WI; NB; NL; NS; ON; PE; QC; YT; South America; Europe; Asia |
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.) |
Distinctive features of Platydictya subtilis include the entire leaf margins, elongate distal cells, and many subquadrate alar cells; the capsule is erect or nearly so. This is the only species of the genus typically found on bark. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 28, p. 283. | FNA vol. 28, p. 284. |
Parent taxa | Amblystegiaceae > Platydictya | Amblystegiaceae > Platydictya |
Sibling taxa | ||
Synonyms | Hypnum jungermannioides, Amblystegiella sprucei | Leskea subtilis, Amblystegiella subtilis, Amblystegium subtile, Serpoleskea subtilis |
Name authority | (Bridel) H. A. Crum: Michigan Bot. 3: 60. (1964) | (Hedwig) H. A. Crum: Michigan Bot. 3: 60. (1964) |
Web links |