Adiantum wilesianum Hook.
Descripción
Rhizomes short-creeping, ca. 5 mm diam.; rhizome scales light brown with thickened, dark brown cell walls, margins denticulate, 1–1.5 X 0.8–1 mm; fronds clumped to subdistant, 70–120 cm long, arching; stipes atropurpureous to blackish, lustrous, to 60 cm X 3–6 mm, ca. 1⁄2 the frond length, glabrous except at bases; blades broadly ovate to deltate, 3–4-pinnate proximally, with conform, 1-pinnate terminal pinna; rachises atropurpureous to blackish, short-puberulent abaxially with hairs 0.1 mm long; pinnae 3–5 pairs, alternate, stalked to 5 cm, distal pinnae 1-pinnate, proximal 1–3 pinna pairs 2–3 pinnate, more distal pairs 1-pinnate; pinnulets dimidiate, subsessile or with stalks to 0.5 mm long, oblong to narrowly trapezoidal, non-articulate, acroscopic margins incised-lobate, minutely denticulate, basiscopic margins entire, concave proximally, toothed distally; veins free, forking, ending in teeth or crenulations; indument absent on both blade surfaces, the costae, costules, and minor axes abaxially with short hairs 0.1 mm long; idioblasts absent; sori 4–6 per pinnulet, confined to acroscopic margins; indusia 1–3 mm long, oblong to lunate, glabrous, doubly recurved (forming pouches); 2n=90 (cult).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 57969, CAS, ENCB; Martínez S. 6995, ENCB). Hgo (Turra 2975, ENCB). Oax (Hernández G. 735, CAS, ENCB, MO, 892, CAS, ENCB, MO, NY). SLP (Kenoyer A7, MO, US). Tab (Cowan 3154, ENCB, NY; Ventura A. 20416, ENCB, MO). Ver (Copeland herb. 119, B, GH, MEXU, MICH, NY, UC, US; Rzedowski 19088, ENCB, NY).A
Elevación
50 – 1200 mA
Ecología y Hábitat
On slopes and along small streams.A
Tipo de vegetación
Selva alta, Selva medianaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
The short, stiff hairs on the abaxial side of the rachises distinguishes A. wilesianum from all other Mexican Adiantums. The species is very similar to A. polyphyllum Willd. from northern South America and Trinidad, but that species has the axes glabrous abaxially and the color of the stalks stops abruptly at the bases of the pinnulets.A