Trichomanes krausii Hook. & Grev.

  • Authority

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

  • Family

    Hymenophyllaceae

  • Scientific Name

    Trichomanes krausii Hook. & Grev.

  • Description

    Species Description - Difficult to distinguish from the much more common T. reptans, but T. krausii can be identified by its occurrence at low elevations, 0–500(–1070) m (vs. 900–2500 m in T. reptans), and the false veins being more or less parallel to the margins and generally not between the true veins; 2n =136 (Jam).

  • Discussion

    Didymoglossum krausii (Hook. & Grev.) C. Presl, Abh. Ko¨nigl. Bo¨hm. Ges. Wiss., ser. 5, 3: 115. 1843. Hemiphlebium krausii (Hook. & Grev.) Prantl, Unters. Morph. Gefa¨sskrypt. 1: 46. 1875. Type. Dominica. Kraus s.n. (E).

    Unverified, Doubtful, or Mistaken Reports. QR (Castillo R. & Tun G. 290, UADY, XAL, cited by Palacios-Rios, 1992, but not verified). Trichomanes krausii is distinct by its occurrence at low elevations, some false veins parallel to the blade margins (virtually none between true veins), and immersed sori. These characters work best for specimens below 500 m, and character states of T. reptans work best for specimens above 1500 m. At intermediate elevations specimens combine the characters, e.g., few false veins and exserted sori. Generally the most false veins are found in specimens collected above 2000 m and fewest below 500 m. More work is needed to resolve the taxonomic status of these two taxa.

  • Distribution

    0–500 m. USA (Fla); Mexico; Guat, Hond, Salv, Nic, CR, Pan; Gr & L Ant; Ven, Trin, Guy, Sur, Fr Gui, Ec, Peru, Braz, Bol, Parag, Arg.

    Argentina South America| Paraguay South America| Bolivia South America| Brazil South America| Peru South America| Amazonas Ecuador South America| French Guiana South America| Suriname South America| Guyana South America| Trinidad and Tobago South America| Venezuela South America| West Indies| Panama Central America| Nicaragua Central America| El Salvador Central America| Honduras Central America| Guatemala Central America| México Mexico North America| Florida United States of America North America|