Cheilanthes farinosa (Forssk.) Kaulf.
Descripción
Rhizomes compact, stout, ascending, 2–4 mm diam.; rhizome scales linear-lanceolate, concolorous, dark reddish brown to bicolorous with black center and brown margins, lustrous, margins entire, 5–6 mm long; fronds to 50 cm long, clumped; stipes 1⁄2–2⁄3 the frond length, terete but grooved adaxially at junction with rachises, atropurpureous with sparse, lanceolate, dark reddish brown scales, occasionally sparsely white-farinose, abscised fronds leaving stipe bases 1.5–2.5 cm long, or not abscised; blades deltate to ovate-pentagonal, pinnate-pinnatifid, bipinnatepinnatifid proximally, basal pairs somewhat exaggerated basiscopically; pinna midveins dark to pinna tips; adaxial surfaces glabrous; abaxial surfaces white-farinose; sori at vein tips, laminar margins curved with thin, strongly modified, 1–1.5 mm wide false indusia; sporangia 64-spored; spores dark brown; 2n=60, 120 (Old World).A
Ejemplar revisado
Ags (McVaugh & Koelz 229, MICH, NY). Chih (Correll & Gentry 23025, NY). Chis (Matuda 1700, NY). DF (Lyonnet 1636, NY). Dgo (Breedlove 18833, NY). Gro (Lorea 1698, FCME). Hgo (Mickel 635, NY). Jal (Iltis 29611, NY). Méx (Lott &Wendt P-97, NY). Mich (Hinton 12363, NY). Mor (Fisher 35420, NY). Nay (González 845, MEXU). Oax (Mickel 1265, NY). Pue (Arsène 2184, MEXU). Qro (Carranza 2839, MEXU). Sin (Pfeifer & Skog 3067, NY). SLP (Palmer 178, NY). Ver (Bourgeau 3058, NY). Zac (Rzedowski & McVaugh 949, NY).
Unverified, Doubtful, or Mistaken Reports. Tam (reported by Lof, f. 27, 1980, but not verified).
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Unverified, Doubtful, or Mistaken Reports. Tam (reported by Lof, f. 27, 1980, but not verified).
A
Elevación
1450 – 3100 mA
Ecología y Hábitat
Moist, wooded, rocky slopes.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This species closely resembles Notholaena candida, but C. farinosa has well developed false indusia, which are absent in N. candida.
Saiki (1984a, b, c) distinguished many species from C. farinosa across its range around the world (40 species in the complex, which included much of what is currently construed as Notholaena). He applied the names Aleuritopteris mexicana and A. chihuahuaensis to the Mexican material here called C. farinosa, but distinguished these on questionable characters, such as indusia continuous versus separate (apparently a function of frond size), blades under 30 cm (but not always), “tripinnate segments in lowest pair of pinnae” (none are tripinnate; the blades are exaggerated basiscopically in the basal pair of pinnae, and thus bipinnate-pinnatifid proximally. He claimed their chemistry is distinct, and the spores slightly different. We believe it is better to retain the name as C. farinosa until more careful detailed studies are made.
The three species of Cheilanthes with farinose fronds in Mexico are sometimes placed in the genus Aleuritopteris, though molecular studies (Gastony & Rollo, 1998) suggest that C. aurea and C. aurantiaca, along with C. leucopoda, may belong in Notholaena.
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Saiki (1984a, b, c) distinguished many species from C. farinosa across its range around the world (40 species in the complex, which included much of what is currently construed as Notholaena). He applied the names Aleuritopteris mexicana and A. chihuahuaensis to the Mexican material here called C. farinosa, but distinguished these on questionable characters, such as indusia continuous versus separate (apparently a function of frond size), blades under 30 cm (but not always), “tripinnate segments in lowest pair of pinnae” (none are tripinnate; the blades are exaggerated basiscopically in the basal pair of pinnae, and thus bipinnate-pinnatifid proximally. He claimed their chemistry is distinct, and the spores slightly different. We believe it is better to retain the name as C. farinosa until more careful detailed studies are made.
The three species of Cheilanthes with farinose fronds in Mexico are sometimes placed in the genus Aleuritopteris, though molecular studies (Gastony & Rollo, 1998) suggest that C. aurea and C. aurantiaca, along with C. leucopoda, may belong in Notholaena.
A