All Floras      Advanced Search
BFNA Vol. 2 Login | eFloras Home | Help
BFNA | Family List | BFNA Vol. 2 | Orthotrichaceae

Macrocoma (J. K. A. Müller) Grout, Bryologist. 47: 4. 1944.
[Refers to long hairs on the calyptrae of some of the species, like a large mane]

Dale H. Vitt

  • Macromitrium sect. Macrocoma J. K. A. Müller

    Plants slender to filiform, mats on trees and rocks. Stems creeping with numerous lateral ascending branches. Branch leaves closely erect-appressed, not contorted when dry, erect-spreading when moist, up to 2 mm, lanceolate to ovate-lanceolate, narrowly obtuse, acute, or bluntly acuminate, carinate, rhizoids often produced on the abaxial side of the costa; margins ± plane, entire; costa percurrent, prominant; distal cells small, rounded-quadrate, bulging, smooth or papillose; basal cells rounded to elliptic, bulging, papillose-mammillose. Perichaetial leaves slenderly acute. Sexual condition goniautoicous. Seta smooth, to 7 mm, dextrose. Capsule exserted, oblong-cylindric to fusiform, ± plicate above or smooth; stomates superficial; peristome single or lacking; consisting of 16 pale, short, blunt teeth or a low, papillose membrane. Calyptra mitrate, long elliptic-conic, ± hairy, completely covering capsule, smooth. Spores rather large, isomorphic.

    Species 11 (1 species in the flora); in higher elevation scrub forests; North, Central and South America, West Indies, Asia, Africa (including Madagascar), Australia, Pacific Islands (Hawaii, New Zealand).

    In addition to the rounded basal cells, characters of the genus include the slender, irregularly branched stems, leaves erect-appressed when dry, capsule cylindric, peristome often reduced, and calyptra long conic-elliptic.

    Lower Taxon

    Related Synonym(s):


    Related Objects  

    Flora of North America  
  • Illustration
  • Illustration

  •  |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |