Argyrochosma pallens (Weath.) Windham
Descripción
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, bipinnate-pinnatifid 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).A
Forma de vida
Rupícola.B
Ejemplar revisado
Chih (Correll & Gentry 22813, LL, NY, US; Pringle 1440, GH, LL, MEXU, MICH, NY, P, US). Dgo (Corral Díaz 75 (=Worthington 9417), NY, TEX). Hgo (Pringle 13643, MICH, UC, US). Jal (Pringle 11899, MICH, US; Palmer 541, NY, US). Oax (Lorence 4801, ENCB; Windham 527, NY). Pue (Purpus 3147, ARIZ, NY, US). SLP (Johnston et al. 12262, LL).
Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros-Dávila 4113, 4124, HUAA, cited by Siqueiros-Delgado & González-Adame, 2004 [as Cheilanthes pallens], but not verified). Gto (Rzedowski 4114, IEB, cited by Díaz- Barriga & Palacios-Rios, 1992, but number is 41146 and specimen is A. incana). Qro (Zamudio 3396, IEB, cited by Díaz-Barriga & Palacios-Rios, 1992, also cited as A. incana, but specimen is A. limitanea subsp. mexicana).
A
Unverified, Doubtful, or Mistaken Reports. Ags (Siqueiros-Dávila 4113, 4124, HUAA, cited by Siqueiros-Delgado & González-Adame, 2004 [as Cheilanthes pallens], but not verified). Gto (Rzedowski 4114, IEB, cited by Díaz- Barriga & Palacios-Rios, 1992, but number is 41146 and specimen is A. incana). Qro (Zamudio 3396, IEB, cited by Díaz-Barriga & Palacios-Rios, 1992, also cited as A. incana, but specimen is A. limitanea subsp. mexicana).
A
Distribución
México (país) EndémicoA
Elevación
1500 – 2920 mA
Ecología y Hábitat
Cliffs and ledges, usually on limestone.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
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).A