Thelypteris nubigena A.R.Sm.

  • 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 nubigena A.R.Sm.

  • Description

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    Species Description - Rhizome suberect; fronds to ca. 65 cm long, 4-5 lowermost pairs of pinnae gradually reduced, the lowest to ca. 1 mm long; stipe to 15 cm long, 3 mm diam., darkened and sparsely scaly at base, scales ovate, tan, sparsely hairy on margin, less than 2 mm long; pinnae ca. 20-25 pairs, the largest 7-12 cm long, 1.5-3.0 cm wide, widest at base, lobed ca. 0.9 towards costae; aerophores to 1 mm long at base of lower pinnae; segments slightly oblique, subfalcate, to 15 mm long and 4 mm wide, rounded to subacute at apex; veins to 12 pairs per segment; rachis, costae, and costules on both sides epaleate, with scattered hairs ca. 0.2 mm long, the hairs often in pairs or threes (subfasciculate); glands on lower surfaces numerous, orangish to reddish, sessile, hemispherical; sori medial; indusia minute, obscured by orangish glands; n =29.

  • Discussion

    Type. Mexico. Chiapas: Mun. San Cristóbal Las Casas, Zontehuitz, Breedlove 22057 (DS!). Thelypteris nubigena differs from other Oaxacan species in its tendency for the hairs on the costae and rachis below to be fasciculate, but not to the same degree as in T. thomsonii. From that species, T. nubigena also differs in the absence of costular aerophores and generally smaller fronds.

  • Distribution

    Along stream banks in pine-oak woods; Ixtlán; 2600 m. Mexico (Oax, Chis); Guat.

    Mexico North America| Guatemala Central America|