Adiantum macrophyllum Sw.

  • Authority

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

  • Family

    Pteridaceae

  • Scientific Name

    Adiantum macrophyllum Sw.

  • Description

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    Species Description - Rhizome stout, short-creeping, 4-7 mm diam.; rhizome scales linear-lanceolate, brown with dark brown, thickened cell walls, ciliate-denticulate, 2-3 mm long, 0.8-1.0 mm wide; fronds clumped, mostly 30-60 cm long, 10-20 cm broad; stipe ca. ½ the frond length, atropurpureous to black, lustrous, glabrous; blade pinnate, narrowly oblong; pinnae 3-8 pairs, with conform terminal pinna, entire, ovate-deltate, broadly cuneate at base, apex acuminate, largest pinnae at base, 80-85 mm long, 25-50 cm wide; pinnae subsessile (pinna stalks 1-2 mm long), not articulate, the dark color of axis entering the pinna base and running down main vein; sterile margin irregularly incised, veins running to teeth, costa running down middle of segment; upper surface glabrous with idioblasts, often glaucous beneath, glabrous; sori continuous, one on each side of pinna, 35-60 mm long, pinna tip sterile, serrulate; indusium glabrous; spores tan.

  • Discussion

    Type. Jamaica. Swartz s.n. (S!). Among the once-pinnate, idioblastic taxa, A. macrophyllum is distinguished from A. obliquum by the single sorus on each side of the pinna, the glabrous stipe, rachis and pinna surfaces, and the roughly equilateral segments.

  • Distribution

    Terrestrial, in wet lowland forests; Choapan, Cuicatlán, Tuxtepec; 100-350 m. Mexico (Gro, Pue, Ver, Oax, Chis); Guat to Pan; WI, Trin; Col & Gui to Bol and Braz.

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