Asplenium vespertinum Maxon
Descripción
Roots filamentous, wiry, not proliferous; rhizomes shortcreeping; rhizome scales blackish or with lighter margins, 2–3 X 0.2–0.4 mm, entire or denticulate distally; fronds clumped, mostly 10–15(–20) cm long; stipes castaneous, lustrous, 2–5 cm X 0.5–1 mm, 1⁄5–2⁄5 of frond length, sometimes abruptly curved at bases, glabrous, not winged; blades herbaceous, linear, 1-pinnate, mostly 10–15 X 1–2.5 cm, glabrous, bases gradually tapered, apices acute, not rooting; rachises castaneous, lustrous, with scattered hair-like scales to 1 mm and a few gland-tipped hairs to 0.3 mm, not winged; pinnae oblong, 15–30 pairs, 5–13 X 3–6 mm, sessile, bases truncate to cuneate, apices obtuse, acroscopic and basiscopic margins shallowly lobed or toothed; veins simple, obscure, tips evident adaxially; indument abaxially of whitish appressed clavate hairs 0.1 mm long; sori 2–6 pairs per pinna, on both sides of midveins; indusia ca. 1–1.5 X 0.2–0.5 mm, margins entire; spores reniform, 64 per sporangium.A
Forma de vida
EpipetricA
Ejemplar revisado
BCN (Jones 3749, CAS, DS, MO, NY, UC, US; Moran 30526, ARIZ, CAS, ENCB, MEXU, MO, NY).A
Elevación
0–350 mA
Ecología y Hábitat
On moist, shaded, canyon walls and at bases of boulders.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
This species differs from related species of the A. trichomanes group, and in particular from A. trichomanes itself, by having the fertile veins (basal acroscopic ones excepted) usually simple, pinnae mostly 6–10 mm long, with length 2–3 times width, and by the dentate or shallowly lobed acroscopic and often basiscopic pinna margins. Other Mexican species of this group with lobed or incised pinnae include A. blepharodes, A. fibrillosum, and A. formosum. The first two of these both have ciliate indusia; Asplenium formosum has even more deeply incised, almost lacerate pinnae.A