Adiantum pulverulentum L.

  • 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 pulverulentum L.

  • Description

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    Species Description - Rhizome short-creeping, 5-9 mm diam.; rhizome scales light brown with thick, dark brown walls, 2-2.5 mm long, 0.3-0.8 mm wide, linear-lanceolate, with marginal hairs (0.1-0.3 mm long); fronds clumped, 30-100 cm long; stipe ca. ½ the frond length, atropurpureous, lustrous, with small (to 3 mm long), brown, pectinate scales; blade bipinnate, 25-50 cm wide; pinnae 3-10 pairs, alternate, with conform terminal pinna, terminal pinnule non-conform, elongate, pinnules tapering to base, basal pinnules reduced to equilateral triangles; segments dimidiate, with small brown scales (0.8 mm) beneath, glabrous above with idioblasts, margin denticulate, largest pinnules 10-20 mm long, broadly acute at tip, upward-pointing; sori generally one per segment, 5-10 mm long, pectinate, linear; indusium erose; spores tan.

  • Discussion

    Lectotype (chosen by Proctor, Fl. L. Antill. 2: 185. 1977). Plumier, Descr. pl. Amér., t. 47. 1693 (=Traité foug. Amér., t. 55. 1705), based on a plant from Martinique or Hispaniola. For additional synonymy, see Lellinger (Mem. New York Bot. Gard. 23: 14. 1972). Adiantum pulverulentum is distinctive among the short-pinnuled, bipinnate, idioblastic species in having one long sorus per segment. One specimen (Hallberg 1264 (NY), Ixtlán) is unusual in that the sori are somewhat lobed. See A. villosum for an account of abortive-spored hybrids with A. pulverulentum.

  • Distribution

    Terrestrial, in wet forests at low elevation; Ixtlán, Juchitán, Putla, Tuxtepec, Villa Alta; 50-1000 m. Mexico (Gro, SLP, Ver, Oax, Chis); Guat to Pan; WI, Trin; Ven & Col to Bol & Braz.

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