Pellaea intermedia Mett. ex Kuhn
Descripción
Rhizomes long-creeping, 1.5–2 mm diam.; rhizome scales linear-lanceolate, bicolorous, black with light brown margins, finely serrulate, 2–4 X 0.3–0.8 mm; fronds to 50 cm long, 0.5–1 cm distant; stipes 1⁄2–3⁄5 the frond length, tan to gray to stramineous, adaxially flattened or terete, glabrous, dull; blades deltateovate to ovate-lanceolate, mostly 2-pinnate, occasionally 3-pinnate, 4–20 cm wide, subcoriaceous; rachises straight and pubescent; pinnae at right angles to rachises, segments 8–17 mm long, short-petiolate, ovate or elliptic, articulate, truncate or cordate or rounded at base, obtuse to mucronate at apices, costae straight to slightly flexuous; adaxial surfaces glabrous; abaxial surfaces glabrous or pubescent; sori not continuous along margins, interrupted at apices, margins reflexed, narrow, hyaline; sporangia 32-spored; n=2n=87, 116, apogamous (USA).A
Forma de vida
TerrestreA
Ejemplar revisado
Chih (Pringle 461, NY, 930, LL, NY). Coah (Hinton 16700, ARIZ, US; Palmer “1426 & 1427,” NY). NL (Correll & Johnston 19922, NY; Hinton 18100, IEB). Son (White 3303, ARIZ). Tam (Breedlove 63463, CAS). Zac (Johnston et al. 11565A, LL p.p.; Lloyd & Kirkwood 22, GH).
Unverified, Doubtful, or Mistaken Reports. Ags (reported by de la Cerda Lemus & Siqueiros Delgado, 1985, but not verified).A
Unverified, Doubtful, or Mistaken Reports. Ags (reported by de la Cerda Lemus & Siqueiros Delgado, 1985, but not verified).A
Elevación
1900 – 2850 mA
Ecología y Hábitat
Rocky slopes and ledges, on a variety of substrates, including limestone and igneous rocks.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Plants of Pellaea intermedia in Mexico are mostly apogamous triploids and tetraploids; a sexual diploid has been found near Saltillo, Mexico (A. Tryon, 1968). Given the morphological similarity among the three cytotypes, the North American polyploids probably were derived from the Mexican diploid through autopolyploidy.
From Pellaea andromedifolia it differs in obscure (vs. visible) veins, and its distribution in northern Mexico (Sonora to Tamaulipas and Zacatecas vs. Baja California Norte).A
From Pellaea andromedifolia it differs in obscure (vs. visible) veins, and its distribution in northern Mexico (Sonora to Tamaulipas and Zacatecas vs. Baja California Norte).A