Thelypteris nubigena A.R.Sm.

  • 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 nubigena A.R.Sm.

  • Description

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    Species Description - Rhizomes suberect; fronds to ca. 65 cm long; stipes to 15 cm x 2–3 mm, darkened and sparsely scaly proximally, scales ovate, tan, sparsely hairy on margins, less than 2 mm long; blades to ca. 50 x 24 cm, 4–5 proximal pairs of pinnae gradually reduced, the lowermost to ca. 1 mm long, lacking proliferous buds; pinnae ca. 20–25 pairs, the largest 7–12 x 1.5–3 cm, broadest at bases, lobed ca. 0.9 the way towards costae; aerophores to 1 mm long at bases of proximal pinnae; segments slightly oblique, subfalcate, to 15 x 4 mm, rounded to subacute at apices; veins to 12 pairs per segment; indument abaxially of scattered hairs ca. 0.1–0.2 mm long on rachises, costae, and costules, the hairs often in pairs or threes (subfasciculate), also with numerous orangish to reddish, sessile, hemispherical glands on tissue between veins; sori medial, with minute indusia obscured by orangish glands; sporangia glabrous; 2n=ca. 116 (Chis).

  • Discussion

    Type. Mexico. Chiapas: Mpio. San Cristo ´bal Las Casas, Zontehuitz, Breedlove 22057 (DS!; isotypes CAS!, ENCB!).

    Thelypteris nubigena differs from other Mexican species in its tendency for the hairs on the costae and rachises abaxially 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; 2600– 2800 m. Mexico; Guat.

    Mexico North America| Guatemala Central America|