Pogonatum pensilvanicum (Hedw.) P.Beauv.

  • Authority

    Sharp, Aaron J., et al. 1994. The Moss Flora of Mexico. Part Two: Orthotrichales to Polytrichales. Mem. New York Bot. Gard. 69 (2)

  • Family

    Polytrichaceae

  • Scientific Name

    Pogonatum pensilvanicum (Hedw.) P.Beauv.

  • Description

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    Species Description - Plants small and scattered on a matted, bright-green, persistent protonema. Fruiting plants simple, 5-8 mm tall; male plants tiny, reddish, little more than an antheridial rosette. Leaves appressed, involute, incurved when dry, somewhat spreading when moist, the best-developed leaves lanceolate, 4-5 mm long, with an elliptic to oblong, sheathing base, 1-1.2 mm wide, and with several low, sermlate lamellae at back of the midrib in the upper half of the leaf; margins sermlate; lamellae undulate-crispate, irregularly crenulate in profile, with marginal cells in section occasionally in pairs, rounded, smooth, 13-16 µm wide when single, 23-26 µm as a pair; cells ofthe leaf sheath prosenchymatous, 30-40 µm long, 15 µm wide, those ofthe lamina quadrate, ± isodiametric, 13 µm, the marginal elamellate portion 8-10 cells wide and the part closest to the lamellate portion bistratose. Dioicous. Setae slender, yellowish, 2-2.5 cm long; capsules cylindric, 3 mm long, 0.8-1 mm in diameter, pale, often appearing glaucous; exothecial cells papillose, rectangular, 13-16 x 23-33 µm; operculum with a short, curved beak; peristome teeth 32, double, deep-red. Spores 13 µm, very finely papillose. Calyptrae dirty-white.

  • Discussion

    Fig. 804

    P. pensilvanicum (Hedw.) P.-Beauv., Mem. Soc. Linn Paris 1- 461. 1823.

    Polytrichum pensilvanicum Hedw., Sp. Muse. 96. 1801.

    Hyvonen (1989a) included Pogonatum abbreviatum Mitt. of Colombia and P. gardneri (C. Müll.) Mitt, of Brazil in the synonymy of P. pensilvanicum. However, the related P. neglectum (Hampe) Jaeg. of Colombia and Venezuela is a good species intermediate between P. pensilvanicum and other species with paired marginal cells of the lamellae.

  • Distribution

    Jalisco and Veracruz.—Mexico; Brazil; North America.

    Mexico North America| Brazil South America| North America|