Diplazium werckleanum Christ
Descripción
Rhizomes erect, stout; rhizome scales black, lustrous, heavily indurate, ovate-lanceolate, 2–4 X 1–1.5 mm, entire; fronds 30–75(–100) cm long; stipes dark at bases, light brown or stramineous distally, 10–18 cm X 1.5–3(–4) mm, 1⁄2–1⁄3 the frond length, glabrous except for blackish scales at bases; blades thickherbaceous to subcoriaceous, 1-pinnate, 15–40 X 8–20 cm, lanceolate to narrowly deltate, apices pinnatifid, lacking buds or occasionally each blade with a bud in the axil of a distal pinna; rachises stramineous to brownish, glabrous; pinnae stalked 2–4 mm, inequilateral, mostly 5–10 pairs per blade, 9–12 X 1.5–2.5(–3.5) cm, lanceate, bases cuneate or excised basiscopically, truncate or slightly auriculate acroscopically, apices acuminate, margins undulate and serrulate to shallowly lobed 1⁄4 the distance to costae; veins free, pinnate, 3–6 branches per main lateral vein, all curving abruptly toward pinna margins; indument adaxially of sparse, papillate hairs less than 0.1 mm long in rachial and costal grooves, abaxially the blades glabrous; sori often confined to first acroscopic branch of a vein group, with indusia 3–11 X 0.3–0.5 mm, erose.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 21151, 26757, DS, 48266, CAS, ENCB, NY; Purpus 7252, NY, UC, US). Gro (Anderson & Laskowski 4361, ENCB; Lorea 6454, ENCB, MEXU). Oax (Hellwig 1395, NY; Mickel 7048, NY; Wendt et al. 5025, CHAPA, MO, NY). Ver (Fink 27, UC; Purpus 15742, UC).A
Elevación
550 – 2700 mA
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
The D. werckleanum group (including D. cristatum and D. lonchophyllum) is taxonomically problematic in southern Mexico and Guatemala. These three species differ from each other in the degree of cutting of the proximal pinnae: in D. werckleanum the proximal pinnae are undulate to shallowly lobed 1⁄4 the distance to costae; in D. cristatum the proximal pinnae are deeply lobed without distinct pinnules and cut 1⁄2–3⁄4 the distance to costae; in D. lonchophyllum and D. drepanolobium (q.v.) the proximal pinnae have free basal pinnules that are merely serrate. There appear to be slight differences in indusial width and margins as well as rhizome scale width and length, but monographic work is necessary to determine if these differences are significant. Diplazium werckleanum may hybridize with D. lonchophyllum in Chiapas and perhaps other areas of sympatry; one such putative hybrid, having malformed spores, is Breedlove 22332 (MO).A