Diplopterygium bancroftii (Hook.) A.R.Sm.
Descripción
Rhizomes long-creeping, 2–5 mm diam.; rhizome scales appressed, castaneous, linear-lanceolate, 3–4(–8) X 0.3–0.5 mm, margins entire or with minute bumps, deciduous leaving a smooth surface; fronds to more than 5 m long, erect to scandent; stipes stout, 1.5–2.5 m long, 3–5 mm diam., stramineous to light brown, glabrescent, smooth to slightly rough from fallen scales; blades with apex dormant, with only two large, bipinnate pinnae or rachis continuing and producing additional pairs of opposite pinnate; dormant buds large with abundant, entire, white to yellowish or tan, ovate to lanceolate, entire scales with cordate base, 6–10 X 1.5–2.5 mm; pinnae 100–250 X 15–30 cm, with lateral wings connecting the ultimate branches (pinnules); pinnules 5–15 X 1.5–3(–4) cm; segments linear, distant, 7–20 X 2–3 mm, decurrent, chartaceous to subcoriaceous, revolute, scaly when young, glabrescent with rare, short, clavate hairs 0.1 mm long; sori inframedial between segment margins and midveins, sporangia 3–5 per sorus, mixed with a few golden hairs 0.5 mm long; 2n=112 (Oax, Jam).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 32393, DS, MEXU; Purpus 6719, NY, UC, US). Gro (Martínez S. 4218, ENCB, MEXU; Rzedowski 18619, ENCB, NY). Oax (Mickel 1105, ENCB, MEXU, NY; Rzedowski 33798, ENCB, MEXU). Pue (Lorea 1070, FCME; Riba et al. 261, MEXU, NY). Ver (Pringle 6076, MEXU; Ventura A. 9598, UAMIZ).A
Elevación
1050 – 2200(– 2600) mA
Ecología y Hábitat
Open lands or light woods at middle to upper elevations.A
Tipo de vegetación
Bosque de pino, Bosque de encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Nakai (1950) applied the name Diplopterygium farinosum (Kaulf.) Nakai to this species and treated Gleichenia bancroftii Hook. as a synonym, but the basionym of the former, Mertensia farinosa Kaulf. (1827), has been more recently applied to a species now regarded as belonging to the genus Sticherus, S. farinosus (Kaulf.) Ching (see Proctor, 1977), endemic to the Lesser Antilles. Neither the collector nor locality were specified in the protologue of Mertensia farinosa according to Proctor.
Østergaard Andersen and Øllgaard (2001) noted that in Ecuador, the dormant rachis buds seem to break dormancy at least annually in favorable habitats, adding a new pinna pair and dormant bud each year. This allows the species to persist in regenerating vegetation, many years after disturbance, and to re-orient the new pinnae so as to assume optimum exposure and support for the scandent fronds.
A
Østergaard Andersen and Øllgaard (2001) noted that in Ecuador, the dormant rachis buds seem to break dormancy at least annually in favorable habitats, adding a new pinna pair and dormant bud each year. This allows the species to persist in regenerating vegetation, many years after disturbance, and to re-orient the new pinnae so as to assume optimum exposure and support for the scandent fronds.
A
Bibliografía
C. SEMARNAT 2019: MODIFICACIÓN del Anexo Normativo III, Lista de especies en riesgo de la Norma Oficial Mexicana NOM-059-SEMARNAT-2010: 101 pp. – https://www.dof.gob.mx/nota_detalle.php?codigo=5578808&fecha=14/11/2019#gsc.tab=0 [accessed 2023-05-04 06:16]