Adiantum braunii Mett. ex Kuhn
Descripción
Rhizomes short-creeping, 4–6 mm diam.; rhizome scales dark castaneous at rhizome apices to mostly black back from the tips, lustrous, 1.5–3 X 0.5 mm, margins entire; fronds 25–80 cm long, clumped, arching; stipes atropurpureous to blackish, lustrous, 20–40 cm X 1–2.5 mm, 1⁄2–2⁄3 the frond length, glabrous except for few broad scales at bases; blades broadly ovate, 3–4-pinnate proximally; rachises atropurpureous, glabrous; pinnae 5–8 compound pairs, alternate, stalked to 4 cm, axes with a pale spot at each branching point along rachises; pinnulets rhombicflabellate, orbicular, or obovate, mostly broadly cuneate (120–180°, rarely less than 90°) at bases, 8–12 mm long, margins incised-lobate, stalked 1–10 mm, stalk color passing into pinnulet bases, non-articulate; veins free, forking, ending at the entire, cartilaginous margins or ending in very small teeth; indument absent on both sides of blades, blades not glaucous; idioblasts absent; sori 1–4 per pinnulet, confined to distal margins; indusia 1–8 mm long, linear-oblong to lunate, glabrous; 2n=60 (Jal).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Davidse et al. 29737, MO, UC). Col (Zúñiga 18302, UC). Dgo (Ortega 4299, US). Gro (Hinton 9766, MO, NY, US). Hgo (Riba 4, NY). Jal (Pringle 1868, B, BR, CAS, DS, K, MO, NY, P, UC, US). Méx (Mickel 683, NY). Mich (Pringle 3385, UC). Mor (Lyonnet 2564, CAS, MO, UC, US). Nay (Mexia 536, CAS, UC, US). Oax (Mickel 6230, ENCB, NY, UC). Qro (Fernández & Acosta 2149, ENCB, IEB). Sin (Mexia 427, B, CAS, MO, UC, US). Son (Gentry et al. 19325, NY, US). Ver (Purpus 6185, MO, NY, UC). Unverified, Doubtful, or Mistaken Reports. Ags (García s.n., HUAA, cited by Siqueiros-Delgado & González-Adame, 2004, but not verified).A
Elevación
(150 –)350 – 2200 mA
Ecología y Hábitat
On lava flows.A
Tipo de vegetación (notas)
Oak and pine woods, subtropical forests.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Among the 2–5-pinnate species with tapering blade apices, this species is distinguished by having non-articulate stalks with the color passing onto the pinnulet bases, and raised whitish patches at the bases of the costae. The specimen cited from Hidalgo is atypical in the small fronds and pinnulets and the lack of whitish patches at the bases of the pinnae.A