Trichomanes krausii Hook. & Grev.

  • Authority

    Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.

  • Family

    Hymenophyllaceae

  • Scientific Name

    Trichomanes krausii Hook. & Grev.

  • Description

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    Species Description - Rhizome slender, long-creeping, densely clothed with minute, blackish, hairlike rhizoids. Fronds 2-4(-9) cm long, short-stipitate; stipes 0.5-1 (-1.5) cm long, together with proximal part of rhachis densely blackish-radiculose like the rhizome. Blades broadly oblong to lance-oblong, 1-2.5 cm broad near the middle, deeply pinnatifid to 2-pinnatifid; rhachis winged; segments oblong- linear, unequal, separated by broad, open sinuses each with a large stellate hair on a tooth at the bottom, the margins otherwise with simple or forked hairs, often slightly to strongly undulate; veins free, pinnately branched from the costa at an oblique angle, catadromous; false veinlets usually few, parallel to the tme veins and often parallel to and near the margins; tissue membranous, somewhat translucent. Sori several on a frond, solitary at the tips of apical or distal segments; involucres cylindric-turbinate, 1.5-2 mm long, partly immersed or at leastwinged; mouth broadly two-lipped, flaring; lips semi-orbicular, usually with marginal dark brown line one cell wide, sometimes also with a paler brown zone several cells wide; receptacle becoming somewhat exserted with age; spores subglobose, densely tuberculate.

  • Discussion

    Type. Kraus s.n., from Dominica (E).

    Syn. Didymoglossum krausii (Hooker & Greville) K. Presl, Hymenophyllaceae 23. 1843.

    Hemiphlebium krausii (Hooker & Greville) Bosch ex Prantl, Unters, Morph. Gefasskrypt. 1: 46. 1875.

  • Distribution

    General Distribution. Florida, Greater and Lesser Antilles, and continental tropical America from Mexico to Argentina and Brazil. Distribution in Puerto Rico. Widely distributed; recorded from Arecibo, Cayey, Ciales, Gurabo, Hatillo, Isabela, Mayagñez, Naguabo, Quebradillas, Utuado, and Yabucoa. Habitat. On mossy tree-trunks and on sides of boulders in deep shade at low to middle elevations (45-270 m), locally common.

    Florida United States of America North America| México Mexico North America| San Martin Argentina South America| Brazil South America|