Trichomanes pinnatum Hedw.

  • 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 pinnatum Hedw.

  • Description

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    Species Description - Rhizome short-creeping or curved-ascending, woody, producing wiry prop roots, and clothed at apex with lustrous brown hairs. Fronds fasciculate, pinnate, slightly dimorphic, with translucent, firmly membranous tissue. Sterile fronds short-stipitate, the blades spreading or recurved, each usually terminating in a naked, flagelliform tip producing altemate proliferous buds along the sides. Fertile fronds erect, with stipes mostly 10-30 cm long (or sometimes much shorter), very narrowly green-winged distally, glabrous or with a few deciduous brown hairs; blades dehate-oblong to ovate (excluding the elongate terminal pinna), 10-25 cm long, 6-25 cm broad, pinnate at base, pinnatisect distally; rhachis narrowly winged, sparsely hairy or glabrate; pinnae 3-10 pairs, ligulate-oblong, 4-13 cm long, 0.8-2 cm broad, the lower ones free and sessile or short stalked, the distal ones adnate or decunent; veins numerous, simple or 1 - to 2-forked, united at the tips by a marginal vein. Sori numerous on both margins; involucres sessile or short-stalked, with cartilaginous margins and slightly bilobed apex.

  • Discussion

    Type. Hedwig, t. 5, fig. 1 (as cited above), based on material from Jamaica, possibly sent to Hedwig by Swartz.

    Syn. Trichomanes fioribundum Humboldt & Bonpland ex Willdenow in Linnaeus, Sp. pl, 5: 505. 1810. (A renaming of T. pinnatum.)

    Neurophyllum pinnatum (Hedwig) K. Presl, Hymenophyllaceae 19. 1843. (Much further synonymy exists but is not relevant here.)

  • Distribution

    Greater and Lesser Antilles, Tobago, Trinidad, and continental tropical America from Mexico to Brazil and Bolivia. Distribution in Puerto Rico. Known from a few scattered localities; recorded from Fajardo, Guaynabo, Luquillo, Mayagiiez, Rio Grande, and San Juan. Habitat. Moist shaded earth or clay banks, especially near streams, at low elevations (50-250 m), rare or locally common.

    Trinidad and Tobago South America| México Mexico North America| Brazil South America| Bolivia South America| Puerto Rico South America| Fajardo Puerto Rico South America| Guaynabo Puerto Rico South America| Luquillo Puerto Rico South America| Rio Grande do Sul Brazil South America| San Juan Argentina South America|