Astrolepis cochisensis (Goodd.) D.M. Benham & Windham
Descripción
Rhizomes short, stout, compact; rhizome scales 5–9 mm, tan or slightly darker near bases, linear, ciliate-dentate to entire; fronds 6–40 cm, clumped; stipes 1⁄6–1⁄3 the frond length; blades linear, pinnate to pinnate-pinnatifid; pinnae 14–45 pairs, ovate to oblong or narrowly deltate, cordate to truncate or rounded at bases, entire to shallowly lobed, less than 1⁄3 of the way to the costa, lobes 1–4, shallow, rounded; largest pinnae 4–7 X 2.5–4 mm, basal pinnae lacking basiscopic lobes; abaxial surfaces with dense, imbricate, ovate-lanceolate, mostly 0.5–1 mm long, ciliate scales; adaxial surfaces with sparse, deciduous to persistent, substellate to lanceolate, 0.2–0.5 mm long, coarsely ciliate scales, the scale body 5–7 cells wide; sporangia containing 32 or 64 spores; 2n=58 (Coah, NL); n=2n=87, 116 (USA).A
Ejemplar revisado
Ags (Rzedowski 25061, NY). BCN (Wiggins 7578A, DS). Chih (Mexia 2624, NY). Coah (Hinton 16512, NY). Dgo (Pennell 18610, NY). NL (Pennell 17036, NY). SLP (Parry & Palmer 991⁄2, NY). Son (Rose 12432, NY). Tam (González Medrano 8626, MEXU). Zac (Stanford et al. 548, NY).A
Elevación
1200–2400 mA
Ecología y Hábitat
Rocky slopes and cliffs, mostly limestone and other calcareous substrates.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Benham (1992) and Benham and Windham (in FNA Ed. Comm., 1993) recognized three subspecies of A. cochisensis based on spore number per sporangium, size of spore, and plant substrate. Here we treat these as cytotypes, without giving them formal rank.
Key to Cytotypes (subspecies of Benham & Windham) of A. cochisensis
1. Spores 64 per sporangium, 39–46 µm; diploids of calcareous sites; N Mex, Tex; n Mexico..cytotype chihuahuensis.
1. Spores 32 per sporangium, 59–86 µm; apogamous triploids of calcareous or non-calcareous sites.
2. Spores 72–86 µm; on non-calcareous substrates; Ariz.......cytotype arizonica.
2. Spores 59–70 µm; on calcareous substrates; Calif-Okla; n Mexico.......cytotype cochisensis.
Benham (1989) reported that isozyme analyses suggest that subsp. cochisensis is an autotriploid derivative of the diploid subsp. chihuahuensis. Evidence from isozymes and substrate preferences of subsp. arizonica indicate, however, that it is not a simple autotetraploid and that other taxa remain to be discovered within the Astrolepis cochisensis complex (D. M. Benham & Windham, in FNA Ed. Comm., 1993).A
Key to Cytotypes (subspecies of Benham & Windham) of A. cochisensis
1. Spores 64 per sporangium, 39–46 µm; diploids of calcareous sites; N Mex, Tex; n Mexico..cytotype chihuahuensis.
1. Spores 32 per sporangium, 59–86 µm; apogamous triploids of calcareous or non-calcareous sites.
2. Spores 72–86 µm; on non-calcareous substrates; Ariz.......cytotype arizonica.
2. Spores 59–70 µm; on calcareous substrates; Calif-Okla; n Mexico.......cytotype cochisensis.
Benham (1989) reported that isozyme analyses suggest that subsp. cochisensis is an autotriploid derivative of the diploid subsp. chihuahuensis. Evidence from isozymes and substrate preferences of subsp. arizonica indicate, however, that it is not a simple autotetraploid and that other taxa remain to be discovered within the Astrolepis cochisensis complex (D. M. Benham & Windham, in FNA Ed. Comm., 1993).A