Dryopteris nubigena Maxon & C.V.Morton
Descripción
Rhizomes erect; rhizome scales concolorous, castaneous to dark brown, 5–10 X 1.5–2 mm, ovate-lanceolate, margins entire or with minute glands; fronds 33–85 cm long; stipes usually dark brown to atropurpureous at bases, stramineous to light brown distally, 20–40 cm X 1–3 mm, ca. 1⁄2 or slightly more of the frond length, bases usually with numerous scales similar to those of rhizomes, glabrous distally; blades herbaceous, dark green, broadly deltate, 3-pinnate-pinnatifid proximally, 2-pinnatepinnatifid to 3-pinnate distally, 12–42 X 9–44 cm, with pinnae opposite to subopposite throughout, spreading to slightly ascending ca. 75–90° from rachises, 8–12 pairs; rachises stramineous, lacking scales, minutely stipitate-glandular or eglandular; proximal pinnae the longest, strongly inequilateral, 5–22 X 2.5–13 cm, stalked to 1.5 cm, basiscopic pinnules more strongly devel oped, 1.5–7 cm long, acroscopic pinnules shorter, 1–5 cm long; distal pinnae sessile or stalked to 5 mm, ± equilateral, pinnules to 15 pairs per pinna, margins toothed; indument abaxially lacking or of sparse catenate hairs 0.1–0.3 mm long on costae and costules, also with moderate to dense yellowish short-stipitate glands 0.1 mm on costae, costules, veins, and surfaces between veins, adaxially the surfaces glabrous or often with short-stipitate glands; sori submarginal, indusia tan, 0.8–1 mm diam., flat, stipitate-glandular.A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 22069, DS, NY, 22721, DS, MEXU, NY, 22818, 40334, 41739, DS, 55850, CAS, ENCB, NY; Fraser-Jenkins 13119, UC). ?Hgo (Sánchez Mejorada 757, MEXU). Méx (Hinton 3447, K, NY, 3469, BM, K, US). Oax (Barrington 1734, UAMIZ; Mickel 4056, 4136, NY, 5285, ENCB, NY, UC, very atypical).
A
A
Elevación
2150 – 3000 mA
Tipo de vegetación
Bosque de pino-encino, Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
The glabrous stipes with darkened bases, deltate proximal pinnae much more developed basiscopically, and appressed septate hairs characterize this species. Some specimens from Oaxaca and Chiapas are smaller than the type, but otherwise very similar. The specimen cited from Hidalgo (Plan del Ayacahuite, El Chico) is incomplete, but if it is not this species then it is possibly undescribed. Citation of specimens from Guerrero (Lorea-Hernández & Velázquez M., 1998) is the result of confusion with D. futura, which see for comparison.
Mickel 4056, 4136, and 5285 are very atypical (unusually small, and so less dissected) for this species. In addition to their small size, they differ in having stramineous stipes, lighter stipe base scales, medial sori, and sparsely glandular blades. The description of D. nubigena above does not take into consideration the variation in these collections.
A
Mickel 4056, 4136, and 5285 are very atypical (unusually small, and so less dissected) for this species. In addition to their small size, they differ in having stramineous stipes, lighter stipe base scales, medial sori, and sparsely glandular blades. The description of D. nubigena above does not take into consideration the variation in these collections.
A