Alsophila tryoniana (Gastony) D.S. Conant
Descripción
Trunks to 4.5 m tall; stipe spines ca. 1 cm, black; stipe scales castaneous, with pale margins and each with a dark persistent apical seta and occasionally dark lateral setae; blades to 1.7 m, 2-pinnate-pinnatifid, rachises pale brown; pinnae to 65 cm, abaxial pinna rachis scales linear, whitish with black setae at apex and laterally; pinnules with whitish bullate scales with black apical setae, also usually marginally setulose, distally the scales bullate but without black setae, segments also with stiff hairs ca. 0.5 mm; sori medial; indusia absent.A
Forma de vida
TerrestreA
Ejemplar revisado
Ver (Lira 140, 160, MEXU; Nee 24992, XAL; Ramírez 830, 1026, 1175, 1184, XAL; Riba et al. 1087, 1094, UAMIZ; Sousa 3604, MEXU).A
Elevación
1100 – 2500 mA
Tipo de vegetación
Bosque de neblina/mesófilo, Selva alta, Selva medianaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Alsophila tryoniana is distinct by the exindusiate sori and bullate scales on the segment midveins abaxially. Conant (1983) has suggested that this species arose as a cross between A. firma and A. salvinii.A