Cheilanthes microphylla (Sw.) 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

    Cheilanthes microphylla (Sw.) Sw.

  • Description

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    Species Description - Rhizome slender, short- to long-creeping; rhizome scales 1.5-2 mm long, reddish-brown, bicolorous, linear, somewhat tortuous; fronds to 30 cm long; stipe castaneous to black, lustrous, terete, glabrate with scattered 1-3 mm golden hairs; distal stipe and rachis puberulent adaxially with 0.2-0.5 mm long hairs, hirsute abaxially with appressed, 1-3 mm long hairs; blade bipinnate-pinnatifid, lanceolate, coriaceous; upper surface with scattered 0.3-0.5 mm white hairs; lower surface with scattered to dense 0.3-0.5 mm white hairs along veins; sori elongate along vein ends forming marginal band 0.5 mm wide, laminar margin curved, modified into 0.3 mm wide false indusium, margin entire; spores tan.

  • Discussion

    Adiantum microphyllum Swartz, Prodr. veg. ind. occ. 135. 1788. Type. Jamaica. Swartz s.n. (S!; isotype BM!). See Cheilanthes alabamensis, C. aemula and C. fimbriata for discussion of differences.

  • Distribution

    Limestone outcrops; Juchitán, Tuxtepec; 300-1450 m. Mexico (Son, Chih, Coah, Zac, NL, SLP, Tam, Hgo, Ver, Pue, Oax, Chis, Yuc); US (Tex, Fla); WI; Ven & Col to Bol.

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