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

  • Authority

    Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

  • Family

    Thelypteridaceae

  • Scientific Name

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

  • Description

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    Species Description - Rhizomes erect; fronds mostly (30–)40–75 cm long; stipes often brownish, 4–13 cm x (1–)2–3 mm, puberulous; blades chartaceous, mostly 40–65 x 10–20 cm, with 3–6 pairs of reduced proximal pinnae, lowest of these a few mm long, 2–6 cm apart, lacking proliferous buds; pinnae ca. 15–25 pairs, largest 5–8(–10) x (1–)1.2–2(–2.6) cm, deeply incised to within 1 mm of costae; aerophores absent; segments oblique, subfalcate, 2–3 mm wide, obtuse to acutish; veins 8–10 pairs per segment; indument abaxially of numerous acicular hairs, dense short hairs ca. 0.2 mm long on rachises, sometimes with a few longer hairs intermixed, hairs mostly 0.2–0.4 mm long on costae, veins, and tissue between veins, also with a few hamate hairs on tissue between veins, adaxially with stout, stiff hairs 0.5–1 mm long on costae, costules, and veins, both sides eglandulose; sori supramedial to submarginal, with very small tan indusia concealed by mature sporangia, margins short-ciliate; sporangia glabrous; 2n =58 (Ver, Chis, Trin).

  • Discussion

    Polypodium oligocarpum Humb. & Bonpl. ex Willd., Sp. Pl., ed. 4, 5(1): 201. 1810. Dryopteris oligocarpa (Humb. & Bonpl. ex Willd.) Kuntze, Revis. Gen. Pl. 3: 378. 1898. Amauropelta oligocarpa (Humb. & Bonpl. ex Willd.) Pic. Serm., Webbia 31: 251. 1977. Type. Venezuela. Caripe, Humboldt & Bonpland s.n. (B-Willd. 19699, part!; isotype P-Bonpl.!). Dryopteris columbiana C. Chr., Kongel. Danske Vidensk. Selsk. Skr., Naturvidensk. Math. Afd., ser. 7, 4: 279, f. 8. 1907. Thelypteris columbiana (C. Chr.) C. V. Morton, Leafl. W. Bot. 8: 194. 1957. Type. Colombia. [Magdalena:] Santa Marta, Smith 998 (P, not found; isotype UC!). Phegopteris pilosula Fe´e, Me´m. Foug. 8: 90. 1857. Type. Mexico. Linden 126 (RB?; see Windisch, 1982. Placed here on the authority of Christensen, 1920: 125.). Complete synonymy given in Smith (1983).

    Unverified, Doubtful, or Mistaken Reports. Me´x (Aranda 13 and Mojica P. 10, both IZTA, cited by Tejero-Di´ez & Arregui´n-Sa´nchez, 2004, but these specimens are T. rudis). Thelypteris oligocarpa differs from T. pilosula by the combination of hamate hairs on the tissue between veins abaxially, supramedial to submarginal sori with small indusia (smaller than in T. pilosula), fewer pairs of reduced proximal pinnae, and densely and uniformly short-hairy rachises abaxially. Most of the ca. 75 collections seen are from Veracruz, Oaxaca, and Chiapas.

  • Distribution

    In wet woods, especially along streams and trails, sometimes in coffee understory; 600-2200 m. Mexico; Guat, Hond, Nic, CR, Pan; Gr Ant; Col, Ven, Ec, Peru, Braz, Bol, nw Arg.

    Mexico North America| Argentina South America| Bolivia South America| Brazil South America| Peru South America| Amazonas Ecuador South America| Venezuela South America| Amazonas Colombia South America| Panama Central America| Puntarenas Costa Rica Central America| Nicaragua Central America| Honduras Central America| Guatemala Central America|