Drepanocladus exannulatus (Schimp.) Warnst.

  • 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

    Campyliaceae

  • Scientific Name

    Drepanocladus exannulatus (Schimp.) Warnst.

  • Description

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    Species Description - Plants green or yellow-brown, somewhat shiny and often tinged with red or purple, up to 25 cm long. Stem ± pinnately branched, sometimes plumose. Leaves twisted and striolate to striate when dry, somewhat to strongly falcate-secund, 2-5 mm long, ovate-lanceolate, gradually long-acuminate (the apex sometjmes subobtuse), ± rounded to the insertion and distinctly auriculate; margins ± serrulate, usually to the base; costa rather broad, extending well into the acumen, sometimes ending near the apex; alar cells hyahne, thin-walled, and conspicuously inflated in auriculate groups extending nearly to the costa. Dioicous. Setae 30-75 mm long; capsules 2.2-3 mm long; annulus none; operculum conic, apiculate; exostome teeth brown or yellow-brown and finely papillose; endostome segments not perforate and ciha in groups of 2 or 3. Spores 15-24 µm, very finely papillose.

  • Discussion

    Fig. 674d-f

    D.ejtaww/amj (B.S.G.) Warnst., Beih. Bot. Centralbl. 13:405.1903.

    Hypnum exannulatum B.S.G., Bryol. Eur. 6(fasc. 57/61). 1854.

    Drepanocladus exannulatus var. mexicanus Card., Rev. Bryol. 37: 54. 1910.

    Wamstorfia exannulata (B.S.G.) Loeske, Hedwigia 46:310.1907.

    Drepanocladus exannulatus has pinnate branching (especially noticeable in submerged forms), alar cells conspicuously inflated in auriculate groups extending inward to the costa or nearly so, and margins sermlate, often nearly to the leaf base. When dry, the leaves are rather flat and often striolate. The sermlate leaf margins eliminate D. aduncus from consideration (as do numerous other features).

    Although Cardot supplied a description for the var. mexicanus, he noted that he saw no distinguishing characters!

  • Distribution

    Submerged or in seepage; Baja California, Chiapas, Coahuila, Distrito Federal, Mexico, Michoacan, Oaxaca, Puebla, Queretaro.—Mexico; Greenland to Alaska, south to New Jersey, New York, Michigan, Wisconsin, Colorado, and California; reported from Arizona; Colombia; widespread in Europe and northern Asia; Japan; Zaire and the Repubhc ofthe Congo; Australia; Campbell Island; reported from the Falkland Islands.

    Mexico North America| Greenland North America| Canada North America| United States of America North America| Europe| Russia Asia| Japan Asia| Zaire Africa| Republic of the Congo Africa| Australia Oceania|