Porotrichum insularum Mitt.

  • 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

    Neckeraceae

  • Scientific Name

    Porotrichum insularum Mitt.

  • Description

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    Species Description - Plants up to 6 cm high, bipinnately frondose above a stipitate base; branches often tapered. Stipe leaves scalelike, appressed or slightly spreading, ovate-lanceolate, cuspidate, entire. Frond leaves ± complanate, narrowly oblong to oblong-lingulate, those of ultimate branches similar but smaller, more narrowly acute or short-acuminate, with coarsely serrate tips; margins plane; costa about 2/3 the leaf length; cells narrow and elongate, with conspicuously thick, pitted walls, those of the alar region brownish but otherwise not differentiated. Setae up to 2 cm long, red; capsules oblong-ovoid; operculum as long as the urn; endostome about as long as the exostome, the cilia short or obsolete.

  • Discussion

    Fig. 564e-k

    P. insularum Mitt., J. Linn. Soc, Bot. 12: 464. 1869.

    P. pittieri Ren. & Card., Bull. Soc. Roy. Bot. Belgique 32(1): 188. 1894.

    P. hanseni C. Mull., Hedwigia 37: 243. 1898.

    Thamnium pittieri (Ren. & Card.) Kindb., Hedwigia 41: 242. 1902.

    The narrow branch leaves with acute, coarsely serrate tips and conspicuously pitted cell walls are distinctive.

    Sastre-De Jesus (1987) included this species in her concept of P. mutabile Hampe.

  • Distribution

    On trees at 2000-3000 m alt.; Chiapas and Oaxaca.—Mexico; Costa Rica; West Indies

    Mexico North America| Costa Rica South America| West Indies|