Adiantum macrophyllum Sw.
Descripción
Rhizomes short-creeping, 4–7 mm diam.; rhizome scales concolorous, linear-lanceolate, brown with dark brown, thickened cell walls, 2–3 X 0.8–1 mm, margins ciliate-denticulate; fronds clumped, mostly 30–65 cm long, arching; stipes atropurpureous to black, lustrous, mostly 20–45 cm X 2–4 mm, ca. 1⁄2–2⁄3 the frond length, glabrous; blades oblong; 1-pinnate, 15–25 X 10–16 cm; rachises atropurpureous to black, glabrous except at bases; pinnae 3–8 pairs, each blade with a conform terminal pinna, fertile pinnae entire, sterile pinnae incised or serrulate, with a costa running down middle of each pinna, ovate-deltate, broadly cuneate proximally, acuminate distally, largest pinnae at blade bases, 5–9 X 2.5–5 cm, subsessile or with stalks 1–2 mm long, the dark color of axis entering the pinna bases, non-articulate; veins free, forking, ending in teeth; indument absent on both surfaces, blades often glaucous abaxially; idioblasts present on both blade surfaces; sori continuous, one on each side of pinnae, interrupted only by the sterile pinna tips; indusia 35–60 mm long on fully fertile pinnae, glabrous; 2n=60 (Jam).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 22133, 31510, DS, NY, 32987, DS, ENCB). Gro (Hinton et al. 10811, NY, US; Lorea 2605, FCME). Oax (Hallberg 1470, NY, UC, US, 1650, NY, UC). Pue (Vera Santos 2573, US). Ver (Copeland herb. 122, B, MICH, NY, UC, US; Ventura A. 8415 ENCB, IEB).A
Elevación
100 – 1000(– 1400) mA
Ecología y Hábitat
Especially near streams.A
Tipo de vegetación
Bosque de neblina/mesófilo, Selva alta, Selva medianaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Among the 1-pinnate, idioblastic taxa, A. macrophyllum is easily distinguished from A. obliquum and A. petiolatum by the broader, opposite pinnae, a single sorus on each side of the pinnae, the glabrous stipes, rachises, and pinna surfaces, and the roughly equilateral pinnae. The young fronds are often very reddish or pinkish, a characteristic of many species in the genus, but most pronounced in A. macrophyllum.A