Polypodium diplotrichum Mickel & Beitel
Descripción
Rhizomes creeping, 6–7 mm diam.; rhizome scales dark brown, lanceolate, 2–3 mm long, spreading, comose; fronds 20–25 cm long, distant; stipes and rachises with dense long hairs 0.8–1 mm long; blades pinnatisect, 5–6 cm wide; pinnae 25–30 pairs, 4–6 mm wide, shorter at blade bases, adnate, apices rounded-acute, margins entire; abaxial laminar surfaces with dense hairs 0.1–0.3 mm long, costae with dense hairs 0.3–0.5 mm long; adaxial surfaces, margins, and midribs with scattered hairs 0.3–0.5 mm long; veins free; sori round; sporangia glabrous.A
Forma de vida
EpífitaA
Ejemplar revisado
Chis (Purpus 6754, NY, UC p.p., US, 7225, UC, US). Oax (only the type collection).
A
A
Distribución
México (país) EndémicoA
Elevación
1375 – 1450 mA
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Similar to P. hartwegianum and P. longepinnulatum, P. diplotrichum differs in its long hairs on stipes, rachises, and laminar surfaces. It resembles P. chiapense in most features, including frond form, comose rhizome scales, and long-hairy stipes, but is distinct in having numerous short erect hairs 0.1–0.3 mm long on the abaxial laminar surfaces and hairs 0.3–0.5 mm long on the costae. Polypodium chiapense has scattered hairs 0.8–1 mm long on its costae and abaxial laminar surfaces. That species was transferred to Pecluma by M. G. Price (Amer. Fern J. 73: 109–116. 1983); however, both P. chiapense and P. diplotrichum have the essential Polypodium characters of long-creeping rhizomes and channelled axes, and lack dark axes and clavate soral paraphyses, characteristic of Pecluma.A