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Habit Plants medium-sized, with red or dark red secondary pigment, sometimes green.
Stem(s)

leaves oblong, ovate, or narrowly ovate, ± abruptly narrowed to apex, straight, concave;

base not or hardly decurrent;

margins entire or nearly so;

apex rounded- or acute-apiculate;

costa ending 4/5 to nearly entire leaf length;

alar region gradually passing into strongly incrassate cells near costa.

Sarmentypnum sarmentosum

Habitat Intermediately mineral-rich fens, around springs, late snow beds, submerged in lakes
Elevation low to high elevations (0-4000 m) [low to high elevations (0-13100 ft)]
Discussion

Sarmentypnum sarmentosum is distinguished by the oblong or ovate stem leaves suddenly narrowed to rounded- or acute-apiculate apices. The apiculus is most distinct in young leaves and is rarely completely absent, but may be eroded in older leaves. The species could be confused with species of Calliergon, which are larger, have broader leaves, and never have a clear red color, or with Straminergon stramineum, which is never red and lacks an apiculus. Straminergon stramineum is more sparsely branched (sometimes unbranched) than Sarmentypnum sarmentosum, and the alar regions are ovate or broadly ovate in Straminergon, transversely triangular in S. sarmentosum.

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

Distribution
from FNA
AK; CO; MT; NH; NY; WA; WY; AB; BC; MB; NL; NT; NU; ON; QC; YT; South America; Pacific Islands (New Zealand, Papua New Guinea); Australia; Greenland; e Africa; Eurasia; Antarctica
Parent taxa Calliergonaceae > Sarmentypnum
Sibling taxa
S. exannulatum, S. pseudosarmentosum, S. trichophyllum, S. tundrae
Synonyms Hypnum sarmentosum, Calliergon sarmentosum, C. sarmentosum var. beringianum, C. sarmentosum var. fallaciosum, C. sarmentosum var. fontinaloides, Warnstorfia sarmentosa
Name authority (Wahlenberg) Tuomikoski & T. J. Koponen: Ann. Bot. Fenn. 16: 223. (1979)
Source Flora of North America vol. 28, p. 403.
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