Cheilanthes eatonii Baker
Descripción
Rhizomes compact to short-creeping, horizontal, ca. 3 mm diam.; rhizome scales linear-lanceolate, bicolorous, with black center and tan margins, lustrous, 3–4 mm long, entire; fronds 15–38 cm long, clumped; stipes 1⁄4–1⁄3 the frond length, castaneous, terete, with abundant linear tan to white scales 1.5–2 mm long; blades narrowly lanceolate, 2–3-pinnate, 1.3–4 cm wide; rachises with loosely imbricate, appressed, linear scales mixed with hairs; pinnae 12–18 pairs, equilateral; segments oblong, obtuse; adaxial surfaces with abundant to sparse curly white to rusty hairs 0.5–1 mm long; abaxial surfaces and axes of pinnae and pinnules with lanceolate, entire scales and with a dense mat of curly hairs; laminar margins somewhat recurved, but not differentiated into false indusia; spores dark brown; n=2n=90, apogamous (Coah, USA).A
Forma de vida
Epipétrica, TerrestreA
Ejemplar revisado
Ags (Rzedowski 25071a, NY). BCS (Moran 18752, ENCB p.p.). Chih (Pringle 6454, NY). Coah (Stanford et al. 202, NY). DF (Schaffner 43, NY). Dgo (Palmer 893, NY). Hgo (Pringle 11277, NY). NL (Grimes 2284, NY). Pue (Pittier 446, US). Qro (Díaz B. 3774-9, IEB). SLP (Burgess 5432, ARIZ). Son (Hartman 360, NY). Tam (Stanford et al. 696, ARIZ). Ver (Tejero-Díez 4198, IZTA). Zac (Palmer 260, NY).A
Elevación
550 – 2850 mA
Ecología y Hábitat
On limestone, less commonly basaltic slopes.A
Tipo de vegetación
Bosque de pino, Matorral de otro tipoB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Cheilanthes eatonii is a highly variable species with apogamous triploid and tetraploid cytotypes. Cheilanthes castanea has sometimes been treated as a distinct species. The type of C. castanea differs in having the segments more evident because the hairs of the abaxial surface are not as long and there are fewer scales on the costules, but most specimens of C. eatonii s.l. are intermediate in laminar pubescence. Cheilanthes eatonii reportedly crosses with C. villosa (Lellinger, 1985) in western Texas and southern New Mexico.
Pinna rachis scales of C. eatonii range from narrowly lanceolate to deltate-lanceolate, whereas C. tomentosa, which is often confused with C. eatonii, has very few scales on the rachillae.
Cheilanthes pinkavae T. Reeves, ined., according toWindham and Rabe (FNA Ed. Comm., 1993), and Lellinger (1985) is the name applied by Reeves (1979) to plants intermediate between C. eatonii and C. villosa, but it has not been validly published.
A
Pinna rachis scales of C. eatonii range from narrowly lanceolate to deltate-lanceolate, whereas C. tomentosa, which is often confused with C. eatonii, has very few scales on the rachillae.
Cheilanthes pinkavae T. Reeves, ined., according toWindham and Rabe (FNA Ed. Comm., 1993), and Lellinger (1985) is the name applied by Reeves (1979) to plants intermediate between C. eatonii and C. villosa, but it has not been validly published.
A