Pteris biaurita L.
Descripción
Rhizomes suberect, moderately stout; rhizome scales 2–2.5 X 1–1.2 mm, bicolorous, centers black, heavily sclerified, margins wide, brown, fringed; fronds 60–100 cm long; stipes 1⁄3–1⁄2 the frond length, stramineous, glabrous with occasional trichomidia; blades pinnate-pinnatifid, with one exaggerated basiscopic pinnule per basal pinna; pinnae sessile; segments to 17–20 X 5 cm, ultimate ones entire, obtuse, adaxial surfaces glabrous, abaxial surfaces glabrous except for occasional trichomidia 0.1 mm long; pinna awns lanceolate 0.1–0.3 mm; veins generally free except for single costal areoles between adjacent costules; indusia 0.5–0.8 mm wide, entire; sporangia mixed with paraphyses 0.3–0.5 mm long; spores reddish brown; n=2n=58 (Jam), 87 (several Old World).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 22573, 32837, DS). Gro (Lorea 2426, FCME; Velázquez 343, FCME). Nay (Ortega 46, US). Oax (Campos V. & Reyes 1423, MEXU; Conzatti 586, 1281, MEXU; Mickel 5166, ENCB, NY, UC; Morton & Makrinius 2383, MICH, US). Ver (Calzada 7534, XAL).A
Elevación
350 – 800 mA
Ecología y Hábitat
Along river banks, in ravines.A
Tipo de vegetación
Selva alta, Bosque de neblina/mesófilo, Selva bajaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Pteris biaurita closely resembles P. quadriaurita in blade form, but is distinguished by the costal areoles.A