Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Hymenophyllaceae
Species Description - Rhizomes stout, 1–2 mm diam., long-creeping; rhizome hairs dense, slender, brown, 1 mm long, and also with occasional thick, dark brown hairs 1–1.5 mm long at frond bases and on stipes; roots absent on climbing stems; fronds 22–30 cm long, distant; stipes ca. 1/4 the frond length, stout, flattened, 0.8–1 mm wide, alate 3/4 of the way to bases, with scattered, short, glandular hairs 0.1 mm long; blades bipinnate to tripinnate-pinnatifid, 6– 10 cm wide, ovate to lanceolate, barely reduced at bases; rachises alate, glabrous except for stubby blackish hairs; pinnae 12–18 pairs, lanceolate, ultimate segments 0.5–0.8 mm wide, margins entire; veins free, false veins absent; sori terminating segments; involucres free from or barely immersed in blade tissue, elongate, 1.8–2 mm long, 0.5–0.8 mm wide at middle, 0.3 mm wide at bases, lips erect, straight or only slightly flaring, concolorous; 2n =72 (Chis, Jam).
Trichomanes scandens Hedw., Fil. Gen. Sp., t. 6. 1799, hom. illeg., non L., 1753. Vandenboschia radicans (Sw.) Copel., Philipp. J. Sci. 67: 51, 54. 1938. Type. Jamaica. Swartz s.n. (S, photos US).
Trichomanes kunzeanum Hook., 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 Bosch, Ned. Kruidk. Arch. 5: 164. 1861. Syntypes. Mexico. Schiede 806 (B), Schaffner 7 (P?, not found).
Unverified, Doubtful, or Mistaken Reports. Tab (Linden 1508, cited by Rovirosa, 1909, but not verified; Rovirosa 1033, s. herb., cited by Cowan, 1983, but not verified). Trichomanes radicans closely resembles T. collariatum in its relatively large fronds and long-creeping rhizomes but is distinct by its involucres with narrow, non-flared lips, long stipes, and broad blades. Specimens from northern states of Mexico are often named T. boschianum J. W. Sturm, a species of the eastern United States, but transitional forms suggest that these small Mexican specimens are merely dwarf forms of T. radicans.
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