Grimmia tenerrima Renauld & Cardot

  • 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 tenerrima Renauld & Cardot

  • Description

    Species Description - Stems up to 10 mm high, rarely more, green, grayish, or glaucous. Leaves imbricate when dry, erect to erect-spreading when moist, keeled above, not or scarcely plicate, up to 1.7, rarely 2 mm long, lanceolate to ovate, ending in a hair point or sometimes muticous, the hair points very short to 1 mm long, smooth or faintly denticulate; margins incurved on 1 side above, bistratose; cells bistratose in the upper half, 6-11 µm, rounded-quadrate, thick- but not sinuose-walled; basal cells somewhat larger, quadrate to short-rectangular (1.5:1), rarely longer, ± hyaline and quadrate with thickened crosswalls in several marginal rows. Dioicous. Perichaetial leaves 1.5-3 mm long, usually ending in hair points up to 1.2 mm long. Setae straight, 1.2-2.2 mm long, usually longer than the capsule; capsules exserted, erect, 1.2-1.6 mm long, subcylindric, smooth; annulus none; operculum bluntly conic; peristome teeth yellowish-red, entire, often cribrose. Spores 9-10 µm, smooth or nearly so. Calyptrae cucullate.

  • Discussion

    Fig. 295

    Grimmia tenerrima Ren. & Card., Bot. Gaz. 15: 40. 1890.

    Trichostomum pulvinatumvar. alpestrisWeb. & Mohr, Bot. Taschenb. 110.1807.

    Grimmia alpestris (Web. & Mohr) Schleich. ex Hornsch. in Nees, Hornsch. &Sturm, Bryol. Germ. 2(1): 139.1827, non Somm., 1826.

    Guembelia alpestris (Web. & Mohr) Hampe ex C.Mull., Syn. Muse. Frond. 1:772. 1849.

    The capsules are emergent to somewhat exserted on a straight seta. The keeled, piliferous leaves have pale alar cells with thickened cross-walls.

  • Distribution

    From moderate to high altitudes; Baja California (Guadalupe and Cedros Islands), Hidalgo, Mexico, Puebla, Veracruz.—Mexico; western North America; northern Michigan, Labrador, and Quebec; Europe; Asia; Africa.

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