Bryum richardsii Sharp

  • Authority

    Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part One: Sphagnales to Bryales. Mem. New York Bot. Gard. 69 (1): 1-452.

  • Family

    Bryaceae

  • Scientific Name

    Bryum richardsii Sharp

  • Description

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    Species Description - Plants robust, not lustrous, in dense tufts, usually matted with rhizoids below. Stems simple or branched by subfloral innovations, often with very slender fihform innovations in the upper leaf axils (fragile and easily deciduous when dry). Leaves ± wrinkled and mostly erect-spreading or spreading even when dry, more spreading and often ± decurved when moist, crowded in a comal tuft but otherwise almost equally spaced except at the extreme base, up to 3.6 x 1.7 mm, obovate or oblong-obovate, slightly acuminate, ± decurrent, distinctly bordered by much longer, thicker-walled, yellowish cells in 2-3 rows; margins slightly reflexed below, plane above the middle and distinctly denticulate toward the apex; costa not strong, usually short-excurrent; upper cells shortly hexagonal to rhomboid-hexagonal, with relatively thick, strongly pitted walls; basal cells rectangular. Dioicous. Setae 2-3.5 cm long; capsules 5 mm long, the neck about 1/4 the length; ciha of endostome usually paired. Spores 18-22 µm, relatively smooth.

  • Discussion

    Fig. 367a-i

    B. richardsii Sharp, J. Hattori Bot. Lab. 54: 183. 1983.

    B. richardsiiSharr) exOchi,]. Fac. Educ. Tottori Univ., Nat. Sci. 39(2): 152. 1980, nom. nud.

    The rosulate leaf arrangement, the slender, shortly excurrent costa, and more or less plane margins distinctly bordered by narrow cells with thick, pitted walls, may show a relationship to B. procerum but much smaller leaves and flagellate axillary branches justify recognition.

  • Distribution

    On humic soil, decaying logs, or bark at base of trees; Chihuahua, Hidalgo, Oaxaca.—Mexico; Ecuador, Bolivia, and Peru.

    Mexico North America| Ecuador South America| Bolivia South America| Peru South America|