Hypnum revolutum (Mitt.) Lindb.

  • 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

    Hypnaceae

  • Scientific Name

    Hypnum revolutum (Mitt.) Lindb.

  • Description

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    Species Description - Plants medium-sized, yellow-green to yellow-brown. Stems prostrate or rarely suberect, up to 5 cm long, regularly pinnate-branched; branches patent, 3-7 mm long, rarely gelliform at the tips. Stem leaves 1.1-1.8 x 0.4-0.6 mm, falcate-secund, ovate- or oblong-lanceolate, gradually narrowed to a rather short or long acumen, slightly plicate; margins subentire to sermlate above, strongly recurved from the base to near the apex; costae usually distinct; upper median cells 30-50(-60) x 4-5 µm; basal cells sometimes yellowish; alar cells subquadrate, 8-15 along the margins, usually with a few larger, rectangular, hyaline cells at extreme angles. Branch leaves a little smaller (1-1.5 x 0.3-0.5 mm), otherwise similar to stem leaves. Perichaetial leaves oblong-lanceolate, with a rather short, subentire acumen, plicate. Setae 10-20 mm long; capsules inclined to horizontal, whitish-to yellowish-brown, 2-3 mm long, 0.6-0.75 mm broad, oblong-cylindric, curved; operculum conic-apiculate; cilia of endostome 2-3. Spores 12-15 µm, almost smooth. (Sporophytes unknown in Mexico.)

  • Discussion

    Fig. 771

    H. revolutum (Mitt.) Lindb., Ofvers. Forh. Kongl. Svenska Vetensk.-Akad. 23: 542. 1866 [1867].

    Stereodon revolutus Mitt., J. Linn. Soc Bot Suppl. 1: 97.1859.

    Hypnum heuflen Jur., Osterr. Bot. Z. 11: 411. 1861.

    Stereodon plicatilis Mitt., J. Linn. Soc, Bot. 8: 40. 1864.

    Hypnum plicatile (Mitt.) Lesq. & James, Man. Moss. N. Amer. 394. 1884.

    Stereodon perrevolutus Broth., Acta Soc. Sci. Fenn. 24(2): 42. 1898.

    Hypnum revolutum is easily recognized by more or less plicate leaves Wlth strongly recurved margins and rather well-defined alar regions consisting of uniformly subquadrate cells.

  • Distribution

    On rocks and soils in exposed habitats or in subalpine forests of ponderosa pine, Douglas fir, oak, etc., at 3000-4500 m alt.; Coahuila, Mexico, Nuevo Leon Puebla, Tamaulipas, Veracruz, Zacatecas. Mexico; Greenland; North America (Alaska, northern Canada, western mountain ranges); southern Argentina; Antarctic Peninsula; northern and high montane areas of Europe and Asia.

    México Mexico North America| Veracruz Mexico North America| Greenland North America| United States of America North America| Alaska United States of America North America| Asia| Argentina South America| Canada North America|