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amblystegium moss, creeping feather-moss

Habit Plants in slender, soft mats.
Stem(s)

and branch leaves similar, soft, not complanate, slightly concave;

costa 10–30 µm wide at base;

alar region reaching from margin 65% distance to costa at insertion;

medial laminal cells 12–55 × 7–12 µm, 3–5:1, walls firm, slightly incrassate, eporose.

Seta

reddish, elongate, 1–2.5 cm.

Capsule

1.5–2 mm, neck well developed;

operculum conic.

Spores

spheric, smooth to minutely papillose.

Perichaetia

with inner leaves suddenly narrowed to apex, plicate, apex acuminate.

Amblystegium serpens

Habitat Tree trunks, rotten wood, rock, soil, (sometimes salty) swamps to xeric habitats
Elevation low to high elevations (0-3000 m) [low to high elevations (0-9800 ft)]
Discussion

Variable features in Amblystegium serpens include the serration of the leaf margin, which ranges from entire to serrulate or even serrate; length of the costa, from very short (less than 1/5 of leaf length) to subpercurrent; the subquadrate to transversely elongate alar cells; and leaf stance, which ranges from erect to spreading. These last two characters have sometimes been used to recognize a separate taxon, var. juratzkanum. However, the continuous range of variation of these characters precludes any infraspecific division within A. serpens, which is a fairly well-circumscribed species with comparatively low levels of plasticity with regard to species of Hygroamblystegium.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Distribution
from FNA
AK; AR; AZ; CA; CO; CT; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; ND; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; YT; Mexico; Central America; South America; n Africa; Pacific Islands (New Zealand); Greenland; Asia; Europe; Australia
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Parent taxa Amblystegiaceae > Amblystegium
Synonyms Hypnum serpens, A. juratzkanum, A. serpens var. juratzkanum
Name authority (Hedwig) Schimper: in P. Bruch and W. P. Schimper, Bryol. Europ. 6: 53. (1853)
Source Flora of North America vol. 28, p. 301.
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