Asplenium fibrillosum Pringle & Davenp.
Descripción
Roots filamentous, fibrous, not proliferous; rhizomes suberect; rhizome scales black, clathrate, 2–4 X 0.3–0.5 mm, entire; fronds clumped, 7–15 cm long; stipes castaneous, lustrous, 1.5–3 cm X 0.4–0.5 mm, ca. 1⁄8 of frond length, with brown, flexuous, hairlike (uniseriate at tips) scales, not winged; blades 1-pinnate, linear, 6–13 X 1.1–1.5 cm, the bases slightly to decidedly reduced, the apices tapering and with a terminal hastate or basally pinnatifid segment, not proliferous; rachises castaneous, lustrous, with scattered hair-like (uniseriate at tips) scales, adaxially with wings 0.1 mm wide or less; pinnae oblong, dimidiate, 15–25 pairs, the proximal 1–3 pairs often reduced and sometimes deflexed, 5–7 X 3–4 mm, sessile, bases slightly auriculate, apices obtuse, margins crenulate to dentate; veins obscure, but tips evident adaxially; indument abaxially of scattered appressed, whitish to tan clavate hairs 0.1–0.2 mm long; sori 1–4 pairs per pinna, on both sides of midveins; indusia 1–2 X 0.5–0.8 mm, margins fimbriate with processes 0.4–0.5 mm long; spores reniform, 64 per sporangium (Pringle 6191, UC).A
Forma de vida
TerrestreA
Ejemplar revisado
Ags (McVaugh 18396, IEB, MEXU, NY). DF (Pringle 8791, CAS, MEXU, MO, NY, UC, US). Dgo (Keil 8879, NY). Gro (Lorea 4254, NY, UC). Gto (Correll & Correll 28820, MEXU, US). Jal (McVaugh 13097, MICH, US). Méx (Arreguin 622, ENCB). Mich (Arsène 6794, MEXU). Mor (Pringle 11257, MO, NY). Qro (Medina-Cota & Barrios 3060, IEB).A
Distribución
México (Country) endemicB
Elevación
1700–3900 mA
Ecología y Hábitat
In ravines, on mossy banks, and on sheltered ledges and grottos in lava fields.A
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
The small plant size, hair-like clathrate stipe and rachis scales, and fimbriate indusia distinguish this species. The closest relative is very likely A. blepharodes, from Baja California, which see. Diminutive forms of A. castaneum are also similar, but that species has less scaly rachises and entire to slightly erose indusia. Rzedowski 47913 (IEB), from Guanajuato, has less strikingly fimbriate indusia than typical forms but is certainly A. fibrillosum, rather than A. castaneum, as cited by Díaz-Barriga and Palacios-Rios (1992).A