Grimmia pilifera P.Beauv.

  • 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

    Grimmiaceae

  • Scientific Name

    Grimmia pilifera P.Beauv.

  • Description

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    Species Description - Plants up to 3 cm long, yellow-brown to nearly black. Leaves imbricate to erect-spreading, strongly keeled above, lanceolate to ovate-lanceolate, long-acuminate, 1.8-3 mm long, exclusive of denticulate hair points up to 1 mm long on upper leaves, short or lacking on lower leaves; margins 2-3-stratose above, recurved on 1 or both sides below; costa prominent at back, usually with 2 guide cells near the base; cells sometimes bistratose in part, short, 6-8 µm wide, thick-walled but scarcely sinuose, becoming longer and ± sinuose downward; basal cells usually long, thin-walled, and hyaline. Dioicous. Perichaetial leaves longer than stem leaves, with hair points as long as 2 mm. Setae straight, about 0.5 mm long (shorter than the capsules); capsules immersed, oblong-cylindric to oblong-ovoid, smooth, 1-1.3 mm long; annulus deciduous, consisting of 2 layers of cells; operculum high-conic; peristome teeth yellow, cribrose or divided in the upper half. Spores 7-8 µm, smooth. Calyptrae mitrate.

  • Discussion

    Fig. 298

    G. pilifera P.-Beauv., Prodr. Aetheog. 58. 1805.

    G. apocarpa var. pilifera (P.-Beauv.) Brid., Sp. Muse. 1: 97. 1806.

    G. pensilvanica Schwaegr., Sp. Muse. Suppl. 1(1): 91.1811.

    G. pensilvanica var. bestii Grout, Bryologist 7: 6. 1904.

    The species is recognized by its long-acuminate, longawned leaves with margins recurved on one or both sides below, inner basal cells with thick, sinuose walls, and basal marginal cells quadrate with thickened cross-walls. It is differentiated from G. affinis by dioicous inflorescences and immersed capsules with shorter setae.

  • Distribution

    On rocks, up to 2000 m alt.; Baja California, Chihuahua, Durango, Mexico.—Mexico; western Texas; widespread in eastern North America; British Columbia; Japan.

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