Hiya nigrescens (Hook.) H.Shang
Descripción
Rhizomes long-creeping, branched, dark brown, with sparse ctenitoid hairs; fronds to 6 m long; stipes reddish to yellowish brown, with spines numerous, straight to often slightly recurved, usually dark-tipped, with hairs often stiff and dark-tipped, also with minute, appressed, multicellular ctenitoid hairs; blades narrowly oblong-lanceolate, usually 4-pinnate-pinnatifid; segments pinnatifid, emarginate at vein tips; laminae usually drying blackish green, chartaceous; hairs 0.5 mm long, sparse on costae and major veins abaxially, glabrous adaxially, costae broadly grooved and naked; sori round, indusial flaps hardly more than a tooth 0.8–1 X 0.1–0.3 mm, subentire to slightly lacerate. 2n=58 (Jam, Oax).A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Hypolepis nigrescens) Chis (Breedlove 21374, DS, 33616, NY; Purpus 6710, PH). Gro (Lorea 3174, FCME). Oax (Hellwig 324, NY; Mickel 1029, 5594, NY; Rzedowski 32984, NY). Ver (Riba 982, MEXU, UAMIZ; Ventura A. 13874, XAL).A
Elevación
250 – 2200 mA
Ecología y Hábitat
Forest margins or in light woods in wet montane forests on Atlantic slope.A
Tipo de vegetación
Bosque de neblina/mesófilo, Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym Hipolepis nigrescens) Of the New World species, this is the most unusual and differs from the others in its chromosome number (n=29 vs. 52), the recurved dark spines, dark-drying laminae, and emarginate teeth. It is the most scandent with long fronds that often unroll slowly with the distal pair of pinnae entirely expanded before the next pair is produced. Plants in Hispaniola are often placed in a different species, Hypolepis hispaniolica Maxon, but that is probably only varietally distinct at best. Hypolepis nigrescens is most closely related to Hypolepis brooksiae Alderw. of Southeast Asia, the type of which Hooker included as a syntype of H. nigrescens.A