Arachniodes denticulata (Sw.) Ching
Descripción
Rhizomes ascending to suberect, short, compact; rhizome scales brown, lustrous, 10–20 X 1–2 mm, linear-lanceolate, entire; fronds clustered, mostly (30–)50–90 cm long; stipes casta neous at base, often stramineous distally, 12–32 cm X (1–)2–4 mm, 1⁄3–1⁄2(–2⁄3) the frond length, glabrous except for linear brown scales at bases; blades dark green adaxially, lighter green abaxially, chartaceous to subcoriaceous, 12–30 X 8–26 cm, deltate to pentagonal, 4-pinnate at bases, the proximal pair of pinnae strongly inequilateral, greatly exaggerated basiscopically, anadromous; rachises glabrous; pinnae alternate; segments oblanceolate to obovate, 5–8 X 3–4 mm, bases cuneate, margins strongly dentate with spinulose tips; indument of costae and costules of sparse, hair-like, fibrillose scales; indusia tan to red-brown, glabrous, persistent, 1–2(–3) mm diam.; 2n=82 (Oax, Chis), 164 (Jam).
A
A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 53600, CAS; Calzada et al. 8728, UC, XAL); Gro (Lorea 3290, FCME). Hgo (Gimate L. 797, NY, XAL). Oax (Croat & Hannon 65634, UC; Wendt 5058, NY). Pue (Ventura A. 366, ENCB, 385, ARIZ, ENCB, LL, NY). Ver (Vázquez B. 489, UC, XAL; Ventura A. 12741, MEXU).A
Elevación
1000 – 2900 mA
Tipo de vegetación
Bosque de neblina/mesófilo, Bosque de encino, Bosque de pino, Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Christensen (1920) recognized eight named forms and varieties and several unnamed ones of this polymorphic species. These variants differ chiefly in size and dissection of the blades, blade texture, and other rather nebulous characteristics. Chromosome counts indicate that polyploidy is a part of this variability. Christensen’s forms seem to be connected by numerous intermediates, so we choose not to apply infraspecific names to Mexican material.A