Argyrochosma pallens (Weath.) Windham
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Authority
Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
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Family
Pteridaceae
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Scientific Name
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Description
Species Description - Rhizomes erect or decumbent; rhizome scales linear-lanceolate and ending in capillary apices, 2-5 mm long, concolorous, reddish brown, entire; fronds to 20 cm long, clumped; stipes 1/5-1/3 the frond length, stipes and rachises castaneous, terete, farinose and with sparse, linear-lanceolate to linear, castaneous scales 1-2 mm long; blades narrowly oblong, 1-2 cm wide, bipinnatepinnatifid to tripinnate; pinnae 9-12 pairs; segments oblong to broadly deltate-ovate, obtuse, not articulate, the dark color of costae passing into bases of segments, but obscurely so; adaxial surfaces sparsely farinose; abaxial surfaces densely white-farinose; sori elongate along veins, forming a band 0.5-1 mm wide, segment margins plane to slightly curved, not modified; 2n=54 (Oax).
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Discussion
Notholaena pallens Weath. ex R. M. Tryon, Contr. Gray Herb. 179: 78, f. 45. 1956. Cheilanthes pallens (Weath. ex R. M. Tryon) Mickel & Beitel, Mem. New York Bot. Gard. 46: 123. 1988, non (Sw.) Desv., 1827. Type. Mexico. Durango: Sandia Station, Pringle 10149 (GH!; isotypes P!, US!).
Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros-Da´vila 4113, 4124, HUAA, cited by Siqueiros-Delgado & Gonza´lez-Adame, 2004 [as Cheilanthes pallens], but not verified). Gto (Rzedowski 4114, IEB, cited by Di´az- Barriga & Palacios-Rios, 1992, but number is 41146 and specimen is A. incana). Qro (Zamudio 3396, IEB, cited by Di´az-Barriga & Palacios-Rios, 1992, also cited as A. incana, but specimen is A. limitanea subsp. mexicana). Argyrochosma pallens is very close to A. incana, but the blades in the former are narrowly oblong (vs. deltate), and the rachises and stipes castaneous, farinose, and bearing sparse scales (vs. black, glabrous, and lacking scales).