Microgramma tecta (Kaulf.) Alston

  • Authority

    Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.

  • Family

    Polypodiaceae

  • Scientific Name

    Microgramma tecta (Kaulf.) Alston

  • Description

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    Species Description - Rhizome slender, 0.3-0.5 mm diam.; rhizome scales 2-3 mm long, concolorous, light brown, narrow, peltate, subspreading, entire; fronds dimorphic, thin; stipe 0-12 mm long in sterile fronds, 1-10 mm in fertile fronds; sterile blade ovate to orbicular or elliptic, 8-20 mm long, 6-13 mm wide, apex obtuse, base cordate to truncate; fertile blade lanceolate, 10-40 mm long, 2.5-5 mm wide, apex obtuse, base cuneate; venation goniophlebioid; both surfaces with numerous narrow, brownish scales, 1-1.5 mm long, orbicular fimbriate base and long hairlike tip; sori round, with narrow scales (like laminar scales) among the sporangia.

  • Discussion

    Acrostichum nanum Liebmann, Mexic. bregn. 171 (seors. 19). 1849. Type. Mexico. Oaxaca: [Dist. Mia-huatlán,] between San Miguel Coatlán and La Galera, 7000-8000' [2130-2440 m] Liebmann [Pl. Mex. 2655, Fl. Mex. 36] (C!). Polypodium blandulum Christ, Bull. Herb. Boissier II, 7:259. 1907. Type. Costa Rica. Espavey, Río Grande, 600 m, 1906, Wercklé s.n. (P!). The small size with distinctly dimorphic fronds, lanceolate blade scales and similar soral scales distinguish this species.

  • Distribution

    Epiphytic; Miahuatlán, Pochutla; 1100-2200 m. Mexico (Oax); CR; Col & Sur, to Bol & Braz.

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