Thelypteris oligocarpa (Humb. & Bonpl. ex Willd.) Ching

  • Authority

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

  • Family

    Thelypteridaceae

  • Scientific Name

    Thelypteris oligocarpa (Humb. & Bonpl. ex Willd.) Ching

  • Description

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    Species Description - Rhizome erect; fronds mostly (30-)40-75 cm long with 3-6 pairs of reduced basal pinnae, lowest of these a few mm long, 2-6 cm apart; stipe 4-13 cm long, 2-3 mm diam., often brownish, puberulous; rachis below usually with dense short hairs ca. 0.2 mm long, sometimes with a few longer hairs intermixed; pinnae ca. 15-25 pairs, largest 5-8(-10) cm long, (1.0-)1.2-2.0(-2.6) cm wide, deeply incised to within 1 mm of costae; segments oblique, subfalcate, 2-3 mm wide, obtuse to acutish; veins 8-10 pairs per segment; costae, veins, and leaf tissue below with numerous hairs mostly 0.2-0.4 mm long, also with a few hamate hairs on leaf tissue, above with stout, stiff hairs 0.5-1.0 mm long on costae, costules, and veins, both sides eglandulose; leaf tissue thin; sori supramedial to submarginal; indusium very small (concealed by mature sporangia), margin short-ciliate; n = 29.

  • Discussion

    Polypodium oligocarpum Humboldt & Bonpland ex Willdenow, Sp. pl. 5: 201. 1810. Dryopteris oligocarpa (Willdenow) O. Kuntze, Revis. gen. pl. 3: 378. 1898. Type. Venezuela. Caripe, Humboldt & Bonpland s.n. (B-Willd. 19699 p.p.!; isotype P-Humb.!). Dryopteris Columbiana Christensen, Kongel. Danske Vidensk. Selsk. Skr., Naturvidensk. Afd. VII, 4: 279, f. 8. 1907. Thelypteris Columbiana (Christensen) Morton, Leafl. W. Bot. 8: 194. 1957. Type. Colombia. H. Smith 998 (P, not found; isotype UC!). Complete synonymy cited in A. R. Smith (1983). Thelypteris oligocarpa differs by the combination of hamate hairs on the lamina below, submarginal sori with a small indusium (smaller than in T. pilosula), relatively few pairs of reduced basal pinnae, and densely and uniformly hairy rachis below.

  • Distribution

    In wet woods, especially along streams and trails, sometimes in coffee understory; Cuicatlán, Ixtlán, Juquila, Mixe, Pochutla, Putla, Villa Alta; 600-1600 m. Mexico (Nay, Jal, Tam, Hgo, SLP, Ver, Oax, Chis); Guat to Pan; Gr Antill; Ven & Col, s to Bol & Braz.

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