Trichomanes radicans Sw.

  • Authority

    Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.

  • Family

    Hymenophyllaceae

  • Scientific Name

    Trichomanes radicans Sw.

  • Description

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    Species Description - Rhizome stout 1.0-2.0 mm diam., long-creeping; rhizome hairs dense slender, brown, 1 mm long, and occasional thick dark brown hairs, 1.0-1.5 mm long at frond base and on stipe; roots lacking; fronds 22-30 cm long, 6-10 cm wide, distant; stipe ca. ¼ the frond length, stout, flattened, 0.8-1.0 mm wide, alate ¾ way to base, with scattered 0.1 mm long stubby glandular hairs; blade bipinnate to tripinnate-pinnatifid, ovate to lanceolate, barely reduced at base; rachis alate, glabrous except for stubby blackish hairs; pinnae 12-18 pairs, lanceolate, ultimate segments 0.5-0.8 mm wide, margin entire; veins free, false veins lacking; sori terminating segments, free from or barely adnate to blade tissue; involucre elongate, 1.8-2.0 mm long, 0.5-0.8 mm wide at middle, 0.3 mm wide at base, mouth only slightly or not flaring, concolorous.

  • Discussion

    Trichomanes scandens Hedwig, Fil. gen. sp., t. 6. 1799, nom. illeg., non Linnaeus, 1753. Vandenboschia radicans (Swartz) Copeland, Philipp. J. Sci. 67: 51, 54. 1938. Type. Hedwig, Fil. gen. sp., t. 6. 1799. Trichomanes kunzeanum Hooker, Sp. fil. 1:127, t. 39d. 1844. Syntypes. Peru. Pangoa, Matthews 1088 (K!), “Papayaco,” Poeppig s.n. (K!); Venezuela. “Caracas,” Linden 176 (K?; isosyntype BM). Trichomanes mexicanum van den Bosch, Ned. Kruidk. Arch. 5: 164. 1861. Syntypes. Mexico. Schiede 806 (B), Schaffner 7 (Herb. Fée, P?). Trichomanes radicans closely resembles T. collariatum in its relatively large fronds and long-creeping rhizome, but is distinct by its involucre with narrow, non-flared lips, long stipe and broad blade.

  • Distribution

    Epiphytic in wet montane forests on Atlantic slope; Centro, Choapan, Ixtlán, Ju-quila, Tehuantepec, Teotitlán, Villa Alta; (600-) 1250-2450 m. Mexico (Chih, Jal, Mich, Gro, SLP, Hgo, Ver, Pue, Oax, Chis); Guat to Pan; WI; Col & Ven, s to Braz & Parag; Old World.

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