Brachythecium acutum (Mitt.) Sull.
  • Icon. Musc. Suppl.

Cite taxon page as 'WFO (2020): Brachythecium acutum (Mitt.) Sull. Published on the Internet; Accessed on: 29 Oct 2020'

General Information

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.

  • Provided by: [B].Flora of North America @
    • Source: [
    • 1
    • ]. 

     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    World Flora Online consortium
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).