Trichomanes diversifrons (Bory) Mett. ex Sadeb.

  • 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 diversifrons (Bory) Mett. ex Sadeb.

  • Description

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    Species Description - Rhizome stout, 4-5 mm diam., erect; rhizome hairs dark brown, 1-2 mm long; roots present; fronds strongly dimorphic, sterile fronds 10-35 cm long, 3-5 cm wide, fertile fronds 30-35 cm long, 0.5-0.9 cm wide, clumped; stipe 1/6-1/3 the sterile frond length, ½ the fertile frond length, stout, 1-1.3 mm wide, brown, alate in distal ¼, base with scattered dark brown hairs 1-2 mm long, glabrous otherwise; sterile blade pinnatifid, reduced at base, apex pinnatifid, often with naked, extended rachis ending in proliferous tip; pinnae 12-36 pairs, 5-6 mm wide, glabrous except for rare, 0.3 mm long, brown hairs on rachis, margin serrate with 0.3-0.5 mm teeth; veins several-forked, repeatedly anastomosing, ending in teeth at margin, false veins lacking; fertile fronds entire, glabrous, veins simple to once-forked, fusing at margin of adjacent involucres and running to margin forming low teeth; sori immersed; involucre 1.5-2 mm long, 0.5 mm wide in middle, mouth 0.8 mm wide, concave, concolorous, forming denticulate margin of fertile frond.

  • Discussion

    Hymenostachis diversifrons Bory, Dict, class, hist. nat. 8: 462. 1825. Feea diversifrons (Bory) Copeland, Philipp. J. Sci. 67: 74. 1938. Type. “Guiane.” Poiteau s.n. (P?). Trichomanes elegans Rudge, Pl. Guian. 24, t. 35. 1805, nom. illeg., non Richard, 1792. Type. “Guiana Gallica.” Martin s.n. (ex Herb. Rudge) (BM; isotype NY!). Trichomanes diversifrons is distinctive in its strongly dimorphic fronds (undivided fertile fronds, pinnatifid sterile fronds), anastomosing veins, and concave involucre mouths.

  • Distribution

    Terrestrial in wet forests at low elevation; Juchitán; 220-300 m. Mexico (Ver, Oax, Chis, Tab); Guat to Pan; Col & Fr Gui to Bol & Braz.

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