Brachythecium acutum (Mitt.) Sull.

Acute brachythecium moss (en)

Species

Bryophytes > Hookeriales > Brachytheciaceae > Brachythecium

Characteristics

Plants medium-sized to large, in loose to dense mats, yellowish to brownish. Stems to 7 cm, creeping, terete-or occasionally subcomplanate-foliate, irregularly pinnate, branches to 8 mm, straight, terete-to subcomplanate-foliate. Stem leaves erect to erect-spreading, loosely imbricate to somewhat spaced, broadly to narrowly ovate-triangular, broadest at 1/10 leaf length or below, not concave, not or slightly plicate, 2-2.8 × 0.8-1.2 mm; base rounded, inconspicuously short-decurrent; margins plane, occasionally recurved distally, minutely and evenly serrulate to subentire; apex gradually tapered to narrow acumen or gradually acuminate, occasionally short-apiculate; costa to 60-70% leaf length, strong, terminal spine absent; alar cells subquadrate or short-rectangular, small to enlarged, 15-30 × 10-14 µm, walls moderately thick, region somewhat differentiated or almost undifferentiated, usually inconspicuous, of 4-7 ± cells, ; laminal cells linear, 60-135 × 8-11µm, ; basal cells to 20-25 × 10-13 µm, region in 2-5 rows. Branch leaves with margins often recurved at base, usually less serrulate; basal laminal cells almost undifferentiated or alar region of 2-7 cells, pellucid, (often hidden by recurved margins). Sexual condition autoicous. Seta red-brown, 2-4 cm, smooth. Capsule inclined to horizontal, red-brown, ovate, slightly curved, 15-20 mm; annulus separating by fragments; operculum conic. Spores 13-18 µm.
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Distribution

Brachythecium acutum world distribution map, present in United States of America

Identifiers

LSID 35179498
WFO ID wfo-0001192560
COL ID N2VZ
BDTFX ID -
INPN ID 787049
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Brachythecium mammilligerum Brachythecium acutum Brachythecium salebrosum subsp. mamilligerum