Pelazoneuron cretaceum (A.R.Sm.) A.R.Sm. & S.E.Fawc.
Descripción
Rhizomes short-creeping, at apices with tan, glabrous, ovatelanceolate scales 3–5 X 1–1.5 mm, with cells ± isodiametric or slightly elongate; fronds 20–60(–100) cm long; stipes stramineous, 5–35(–50) cm X 1.5–4(–7) mm, basal scales like those of rhizomes, otherwise glabrous; blades 13–40(–56) X 10–20(–34) cm, gradually tapering distally; rachises glabrous or glabrescent, lacking scales; pinnae 5–10(–17) X (0.6–)0.9–1.5(–2.1) cm, incised (0.5–)0.7–0.8 the way to the costae, broadest at bases; segments oblique, subfalcate, 2–3(–4) mm wide; veins (4–)6–9(–12) pairs per segment, proximal pair from adjacent segments meeting margins at the sinuses or nearly so; indument abaxially absent on costae, veins, and tissue between veins, or costae with sparse to moderate hairs to 0.5 mm long, sometimes also with light yellowish, stipitate glands; sori supramedial, with indusia glabrous to moderately hairy, sometimes also with stipitate glands; 2n=72 (CR).A
Forma de vida
TerrestreA
Ejemplar revisado
(Related to the synonym Thelypteris cretacea) Chis (Breedlove 35367, DS; Roe et al. 983, MICH, US). Oax (Mickel 6298, NY). Ver (Smith 2123, UC).A
Elevación
300 – 1300 mA
Ecología y Hábitat
Along river banks.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(In relation to the synonym) Thelypteris cretacea is closely related to T. patens and differs from that species chiefly by the decumbent rhizomes. In general, it is a smaller and more glabrous plant than T. patens and lacks the orangish glands along the costules that often characterize T. patens.
Breedlove 35367 is atypical in having prominent auricles at the bases of the proximal pinnae and scattered setae on the stipe base scales. Roe et al. 983 lacks rhizomes and so its identity is somewhat uncertain; it could be merely a depauperate and more glabrous form of T. patens. Citation of this species by Lorea-Hernández & Velázquez M. (1998) from Guerrero, is based on a misidentification of T. patens.A
Breedlove 35367 is atypical in having prominent auricles at the bases of the proximal pinnae and scattered setae on the stipe base scales. Roe et al. 983 lacks rhizomes and so its identity is somewhat uncertain; it could be merely a depauperate and more glabrous form of T. patens. Citation of this species by Lorea-Hernández & Velázquez M. (1998) from Guerrero, is based on a misidentification of T. patens.A