Polypodium christensenii Maxon
Descripción
Rhizomes creeping, 3–4 mm diam.; rhizome scales orange-tan, lanceolate, attenuate, the margins inrolled, entire, 6–7 X 1–1.2 mm; fronds 65–120 cm long, 1 cm or more distant; stipes 1⁄4–1⁄2 the frond length, dark brown, with short, whitish hairs, 0.1 mm; blades pinnatisect, apices usually pinnatifid to blade tips, narrowly oblong, 15–30 cm wide; pinnae 23–30 pairs, broadly adnate to rarely narrowly adnate proximally, linear, 7–18 cm X 1.4–2.2 mm; margins crenulate-serrulate; abaxial surfaces with dense erect hairs ca. 0.5 mm long, hairs on costae 0.6–1 mm; adaxial surfaces with hairs ca. 0.5 mm long; venation free, with rare anastomoses, vein ends conspicuous; sori round, medial; sporangia with hairs 0.1 mm; 2n=74 (Chis).A
Forma de vida
EpífitaA
Ejemplar revisado
Chis (Breedlove 32006, DS, NY, 34803, 41087, CAS, DS).A
Elevación
2000 – 2400 mA
Ecología y Hábitat
On mossy banks.A
Tipo de vegetación
Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Polypodium christensenii is very similar to P. puberulum but seems to differ in the larger fronds to 1.2 m long; stipes dark brown; pinnae irregularly crenulate-serrate along margins; and perhaps in rhizome scales without a greatly expanded base, not as long-attenuate, spreading. This group of free-veined, hairy polypodiums (including P. subpetiolatum) is badly in need of revision.A