Hymenophyllum undulatum (Sw.) Sw.

  • Authority

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

  • Family

    Hymenophyllaceae

  • Scientific Name

    Hymenophyllum undulatum (Sw.) Sw.

  • Description

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    Species Description - Similar to H. myriocarpum and H. fendlerianum in the irregular development of distal pinnae, giving a somewhat indeterminate appearance to the plants, but distinct from the former in the sori not constricted proximally and stipes and proximal part of rachises non-alate (vs. rachises and most of stipe length alate), and from the latter in the segments plane or slightly undulate (vs. very strongly undulate) and sori broader than long (vs. suborbicular); 2n =56 (Jam.).

  • Discussion

    Trichomanes undulatum Sw., Prodr. 137. 1788. Mecodium undulatum (Sw.) Copel., Philipp. J. Sci. 67: 26. 1938. Type. Jamaica, presumably Swartz s.n. (S, photo NY; isotypes BM, L-photo UC).

    Unverified, Doubtful, or Mistaken Reports. Ver (Barnes et al. 72, F, cited by Pacheco, 1994, but not verified). The closest relatives of H. undulatum are H. myriocarpum and H. fendlerianum. Hymenophyllum myriocarpum in Chiapas occurs at higher elevations than H. undulatum; Hymenophyllum fendlerianum, which has more crispate fronds, has been collected with H. undulatum (Breedlove 22383, DS). There is some confusion of H. fendlerianum and H. undulatum in the Antilles. A photograph of the holotype of H. undulatum shows the lamina plane rather than strongly crisped. It remains to be seen whether H. undulatum is indeed a distinct taxon, a form of H. myriocarpum, or perhaps the same as H. fendlerianum.

  • Distribution

    Epiphytic in montane rain forests; 1150–3000 m. Mexico; Guat, Hond, Nic, CR, Pan; Cuba, Jam, Guadeloupe; Col, Ven, Sur, Ec, Peru, se Braz, Bol.

    Mexico North America| Bolivia South America| Brazil South America| Peru South America| Amazonas Ecuador South America| Suriname South America| Venezuela South America| Colombia South America| Guadeloupe South America| Jamaica South America| Cuba South America| Panama Central America| Costa Rica South America| Nicaragua Central America| Honduras Central America| Guatemala Central America|