Grimmia wrightii (Sull.) 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

    Grimmiaceae

  • Scientific Name

    Grimmia wrightii (Sull.) Austin

  • Description

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    Species Description - Plants julaceous, gray-green and hoary, up to 15 mm high. Leaves crowded and imbricate, concave, up to 2 mm long (exclusive of smooth to serrulate hair points up to twice as long as the lamina and broadened at base), broadly obovate or ± orbicular; margins plane, entire or notched-serrulate, ± denticulate at the apex; costa disappearing into the awn; upper cells unistratose, oblong-hexagonal, with straight walls slightly thickened, those at the apex longer and hyaline; basal cells quadrate to rectangular, sometimes hyaline, those at basal margins with thickened cross-walls. Autoicous. Setae straight, shorter than the immersed capsule that is ± cylindric with a truncate base, 0.6-1 mm long, and smooth; annulus of 2-3 layers of cells, sometimes persistent; operculum with a short, straight beak; peristome teeth cleft into 2-5 ± cohering divisions. Spores 6-7 µm, smooth. Calyptrae covering the capsule, campanulate-mitrate, plicate, lobed at base.

  • Discussion

    Fig. 288

    G. wrightii (Sull.) Aust., Bull. Torrey Bot. Club 6: 46. 1875.

    Coscinodon wrightii Sull. in Gray, Man. Bot. (ed. 2), 638. 1856.

    C. wrightii var. brevisUolz., Minn. Bot. Stud. 1(2): 757.1897.

    Jajfueliobryum wrightii (Sull.) Ther., Rev. Bryol. Lichenol. 1: 193. 1928.

    J. marginatum Ther., Rev. Bryol. Lichenol. 1: 194. 1928.

    Grimmia wrightii has broad, concave leaves abruptly narrowed to a hair point as much as twice the length of the body of the leaf and noticeably broadened at the base. The margins at base of the awn are usually serrulate. Grimmia raui Aust. (Minnesota to Utah and south to the Mexican border) has narrower, more acute, somewhat keeled leaves with a distinct costa and the hair point only about as long as the body of the leaf. The margins vary in serration in both G. wrightii and G. raui.

  • Distribution

    Usually on sandstone up to about 2200 m alt.; Chihuahua, Coahuila, Queretaro, Sonora, Zacatecas.—Northern Mexico; western United States from Wisconsin to Montana and south to Texas.

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