Adiantum trichochlaenum Mickel & Beitel
Descripción
Rhizomes short-creeping, 5–8 mm diam.; rhizome scales light brown with thick, dark brown cell walls, 1–1.5 X 0.3–0.5 mm, with recurved teeth along margins; fronds clumped, 55–70 cm long, arching; stipes atropurpureous, 32–40 cm X 2–4 mm, 1⁄2–2⁄3 the frond length, with scattered pectinate scales to 2 mm long, glabrescent except for scales at bases; blades deltate to oblong, 2-pinnate, 20–30(–50) cm wide, each blade with a conform terminal pinna; rachises atropurpureous, with persistent lanceolate to linear scales 1–2 mm long; pinnae 2–5 lateral pairs, terminal pinnules gradually reduced toward the pinna tips; pinnules 10–25 X 4–9 mm, rounded to acute at tips, reduced to equilateral triangular pinnules at pinna bases, non-articulate; veins free, forking, ending in teeth at the margins; indument adaxially absent, abaxially the surfaces with scattered pectinate scales 0.8 mm long; idioblasts conspicuous on both blade surfaces; sori 3–9 per pinnule, along acroscopic and sometimes also along distal pinnule margins; indusia 1–4 mm long, oblong, with castaneous hairs 0.5–0.8 mm long.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 32898, DS, NY, 49098, 49552, 57390, CAS; Martínez S. 10633, 13638, UAMIZ, 16955, XAL; Narave F. et al. 1243, XAL). Gro (Hinton 14678, NY). Oax (Mickel 1312, UC, 6975, NY, UC, 7015, NY; Morton & Makrinius 2335, US).A
Elevación
100 – 1000 mA
Ecología y Hábitat
On wet slopes by streams, Pacific slopes.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Adiantum trichochlaenum is distinctive among the shortpinnuled, idioblastic species by having numerous castaneous hairs on the indusia. Adiantum fructuosum Spreng. of Cuba (see further discussion under Excluded Species) has glabrous indusia. See A. villosum for an account of a putative hybrid involving A. trichochlaenum.A