Archidium donnellii Austin

  • 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

    Archidiaceae

  • Scientific Name

    Archidium donnellii Austin

  • Description

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    Species Description - Plants 2-8 mm high, yellow to yellow-green, forming dense tufts. Stems branching by subapical or lateral innovations. Upper stem leaves lanceolate to narrowly ovate-lanceolate, acuminate, clasping, channeled; margins narrowly recurved, entire to serrulate above; costa strong, percurrent to short-excurrent; median and upper cells irregular, thickwalled, similar to those of perichaetial leaves; basal cells quadrate to short-rectangular. Autoicous. Antheridial buds mostly terminating short branches. Perichaetial leaves erect to erect-spreading, broadly ovate-lanceolate to narrowly long-acuminate, 1.1-2.5 mm long; margins narrowly recurved, faintly and irregularly crenulate above; costa flat and short-excurrent or terete and strongly excurrent; median cells irregularly rhombic-hexagonal to irregularly trapezoidal, mostly 15-70 x 9-12 µm; basal cells lax, thin-walled, rectangular. Capsules terminal, 0.4-0.7 mm broad. Spores 4-60 per capsule, 125-230 µm, irregularly polyhedral, smooth to granulose.

  • Discussion

    Fig. 16a-d

    donnellii Aust., Bull. Torrey Bot. Club 6: 190. 1877.

    irregular areolation and lack of differentiated alar cells of stem leaves distinguish this species from A. ohioense and A. hallii. T h e strong, excurrent costa of the acuminate perichaetial leaves separates A. donnellii from A. acauloides, which has a subpercurrent costa and rounded to obtuse perichaetial and stem leaves.

  • Distribution

    On moist bare sand along ditch banks and margins of fields; Baja California (ca. 15 mi E of Todos Santos, Bowers et al. 5158d, TENN); recorded by Cardenas (1988) from Hidalgo and Mexico and by Delgadillo (1992b) from Michoacan and Puebla.—Mexico; southern and eastern North America.

    North America|