Desmatodon guepinii Bruch & Schimp.

  • 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

    Pottiaceae

  • Scientific Name

    Desmatodon guepinii Bruch & Schimp.

  • Description

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    Species Description - Plants in small, green cushions (yellow-brown below). Stems up to 2 mm long, brown, rounded-pentagonal in section, with a central strand and a little-differentiated cortex but no hyaloderm. Leaves erect-incurved when dry, weakly spreading when moist, concave, 1.2-1.9 mm long, obovate to broadly elliptic, scarcely differentiated in shape at base but occasionally auricled, rounded to acute at the apex, broadly and weakly channeled ventrally on either side of the bulging costa; margins recurved in the lower two-thirds or nearly to the apex, entire, bordered by 1-2 rows of less papillose, often thicker-walled cells; costa long-excurrent as a green to hyaline hair point, circular in section, with the convex ventral surface covered by quadrate, papillose cells in the median part, covered on the dorsal surface by elongate, papillose cells, in section showing a large and distinct dorsal hydroid strand and 2(-3) guide cells in 1 layer; upper cells ± longitudinally seriate, 15-19 µm , rounded-hexagonal, thin-walled, bulging, with 4—6 hollow, bifid papillae per lumen on both surfaces; basal cells differentiated across the leaf, short-rectangular, 20-25 µm wide and 2-3:1, thin-walled. Autoicous. Setae 7-8 mm long, yellow-brown, clockwise-twisted; capsules 1.2-1.4 mm long, cylindric, yellow-brown; exothecial cells rectangular, 25-30 µm and 3-4:1, thin-walled; annulus of 1 row of vesiculose cells; operculum long-conic, about 0.8 mm long, with cells in slightly counterclockwise-twisted rows; peristome teeth hyaline, about 500 µm long, very slightly counterclockwise-twisted, the basal membrane relatively high, up to 75 µm. Spores spherical to ellipsoidal, 13-18 µm, light-brown, papillose.

  • Discussion

    Fig. 268

    D. guepinii B.S.G., Bryol. Eur. 2 (fasc. 18/20). 1843.

    Trichostomum guepinii (B.S.G.) C.Mull., Syn. Muse. Frond. 1: 590. 1849.

    Barbula guepinii (B.S.G.) Schimp., Syn. Muse. Eur. ed. 2,197.1876.

    Tortula guepinii (B.S.G.) Broth, in E. & P., Nat. Pfl. 1(3): 430. 1902.

    Pottia guepinii (B.S.G.) Roth, Eur. Laubm. 1: 295. 1904.

    This species m u c h resembles D . latifolius (Hedw.) Brid. of montane distribution in western North America and elsewhere in subarctic areas, but it is smaller, with leaves less than 2 mm long and cells of the leaf border less papillose. Desmatodon plinthobius Sull. & Lesq. of southeastern and southwestern United States has upper cells less than 11 µm wide. The single report of D. plinthobius from Mexico (Sonora, White, MICH) can be referred to Tortula brevipes.

  • Distribution

    On soil; Baja California.—Northwestern Mexico; southwestern United States; southwestern Europe.

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