Argyrochosma incana (C. Presl) Windham
Descripción
Rhizomes short, stout, compact, horizontal or ascending; rhizome scales 5–6 X 0.8 mm, linear-lanceolate, concolorous, dark lustrous brown, entire; fronds to 30 cm long, clumped; stipes ca. 1⁄2 the frond length, atropurpureous to black, rarely castaneous, lustrous, glabrous, terete; blades deltate, (2.5–)3.5–8 cm wide at bases, 3–4-pinnate at bases, pinnae 6–9 pairs, opposite; segments (2.5–)3–5 mm long, mostly elliptic, gray-green adaxially with sparse white farina, dark color of pinna rachis ending abruptly at base of segments; abaxial surfaces densely white-farinose; segment margins not curved nor modified into false indusia; sori elongate along the veins, forming a band 0.5–1.5 mm wide; 2n=54 (USA).A
Forma de vida
Rupícola, TerrestreB
Ejemplar revisado
Ags (Rzedowski 25048a, NY). Chih (Palmer 215, BM, K, NY, US). Chis (Ghiesbreght 226, G, GH, K, YU). Coah (Wendt & Riskind 1701, NY). Dgo (Miller et al. 346, UC). DF (Langman 2616, US). Gro (Mexia 9014, US). Gto (Kenoyer 1969, US). Hgo (Novoa 28, MEXU). Jal (McVaugh 13093, US). Méx (Pringle 11267, NY, US). Mich (Arsène 5756, US). Mor (Pringle 15698, US). Nay (Téllez 10546, MEXU). NL (Aguirre C. 1093, ENCB). Oax (Mickel 6478, NY). Pue (Clausen 7492, NY). Qro (Díaz-Barriga & Carranza 7359, IEB). SLP (Schaffner 961e, G, GH, K). Sin (Breedlove 18479, NY). Son (Drouet et al. 3667, US). Tam (Stanford 2569, NY). Tlax (Arsène 1739, MEXU). Zac (Breedlove 63973, CAS).
Unverified, Doubtful, or Mistaken Reports. Ver (Ortega & Pattison 2183, XAL, cited by Palacios-Rios, 1992, but not verified).A
Unverified, Doubtful, or Mistaken Reports. Ver (Ortega & Pattison 2183, XAL, cited by Palacios-Rios, 1992, but not verified).A
Elevación
800 – 2950 mA
Ecología y Hábitat
Wooded, rocky slopes, steep banks and ledges, shaded rocks.A
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Argyrochosma incana is the most widespread and variable species of Argyrochosma in Mexico. It is distinct by its deltate, 3–4-pinnate blades with white farina usually limited to the abaxial surfaces.
The species is highly variable in occasionally having (1) smaller segments as little 2 mm wide; (2) farina abaxially; (3) axes somewhat flexuous; (4) axes atropurpureous rather than blackish; and (5) segments more strongly articulate. There is a particularly distinct collection from Coahuila (Clark 6746, NY) that has strongly ascending pinnae and small articulate segments. A group of specimens from Chihuahua (Knobloch 5960, MSC; Pringle s.n., 21 Sep 1888, MEXU, UC), Coahuila (Dorr 2509, MEXU, TEX, 2519, TEX; Henrickson 11909, 11990a, LL), Guanajuato (Correll & Correll 28813, LL), Tamaulipas (Stanford 684, MEXU, 2569, NY), and Zacatecas (Henrickson 13332, 13475, LL) have especially small segments (though the Correll specimen has small and large segments on the same plant), somewhat flexuous rachises, and atropurpureous axes. This may be as distinct as A. delicatula, but more work is needed on this complex.
A
The species is highly variable in occasionally having (1) smaller segments as little 2 mm wide; (2) farina abaxially; (3) axes somewhat flexuous; (4) axes atropurpureous rather than blackish; and (5) segments more strongly articulate. There is a particularly distinct collection from Coahuila (Clark 6746, NY) that has strongly ascending pinnae and small articulate segments. A group of specimens from Chihuahua (Knobloch 5960, MSC; Pringle s.n., 21 Sep 1888, MEXU, UC), Coahuila (Dorr 2509, MEXU, TEX, 2519, TEX; Henrickson 11909, 11990a, LL), Guanajuato (Correll & Correll 28813, LL), Tamaulipas (Stanford 684, MEXU, 2569, NY), and Zacatecas (Henrickson 13332, 13475, LL) have especially small segments (though the Correll specimen has small and large segments on the same plant), somewhat flexuous rachises, and atropurpureous axes. This may be as distinct as A. delicatula, but more work is needed on this complex.
A