Polypodium martensii Mett.
Descripción
Rhizomes creeping, 7–10 mm diam.; rhizome scales pale reddish brown, ovate-lanceolate to lance-attenuate, spreading, 10–12 X 3 mm, bases reddish brown, tips pale, fimbriate-denticulate, tangled; fronds (15–)23–42 cm long, distant; stipes 1⁄6–1⁄4 the frond length, brown, with dense minute glandular hairs 0.1 mm long; rachises dark reddish brown, with dense glandular hairs 0.1 mm long and rare, long, jointed hairs 0.8 mm long; blades linearlanceolate to ovate-lanceolate, pectinate, 5–9(–14) cm wide; pinnae linear-oblong to linear-deltate, 5–10 mm wide, proximal pinnae often greatly reduced, bases equally broadly adnate, not strongly surcurrent or decurrent, obtuse to acute; costae dark; adaxial blade surfaces and margins with scattered, lax, white hairs 0.8–1 mm long; abaxial costae and veins with scattered hairs; veins free; sori round, submedial; sporangia with setae 0.5–0.8 mm long.A
Forma de vida
EpífitaA
Ejemplar revisado
Chih (Spellenberg et al. 12090, UC). DF (Pringle 11798, US). Gto (Rzedowski 44770, IEB). Hgo (Fisher 37101, US). Jal (Rzedowski 27518, NY). Méx (Rzedowski 21711, NY). Mich (Hinton et al. 13282, NY). Mor (Lyonnet 2477, MEXU, US). NL (Hinton et al. 23268, TEX). Oax (Pringle 4917, GH, LE, NY, US). Pue (Purpus 4042, NY, US). Qro (Rzedowski 47980, IEB). SLP (Palmer 174, NY). Tam (Lof 704, UC). Ver (Nee 23091, NY).A
Distribución
México (país) EndémicoA
Elevación
1800 – 3100 mA
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Among the free-veined, hairy-bladed polypodiums, P. martensii is distinguished by its entire margins, large rhizome scales, and long-setose sporangia. Disjunct material from Chihuahua has smaller fronds 7–20 cm long, deltate or deltate-lanceolate blades, pinnae not reduced proximally as in other parts of the range, and pinnae only 3–5 mm wide.A