Alsophila firma (Baker) D.S. Conant
Descripción
Trunks to 10.5 m tall, 30 cm diam.; stipe spines stout, to 12 mm long, black, curved; stipe scales very narrow, dark brown with pale erose margins and long dark persistent setae tip; blades to 3 m long, 2-pinnate-pinnatifid, very firm to subcoriaceous; pinnae stalked to 1 cm; veins mostly simple; pinnule apices acute, slightly ascending, crenulate, but margins often recurved; hairs on costules and segment midveins abaxially, costules also with small black-tipped scales, lacking bullate scales; segment midveins glabrous adaxially or with a single hair near the tip; costules hairy adaxially; sori medial; indusia globose, sphaeropteroid; 2n=138 (CR).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 23321, NY, 32194, DS). Hgo (Arreguín 499, NY). Méx (Hinton 3629, US). Oax (McVaugh 22455, MICH; Mickel 1089, NY). Pue (Arreguín 536, NY). Qro (Rubio 311, ENCB, IEB, MEXU). SLP (Mickel 581, NY). Ver (Ventura A. 4518, NY).
Unverified, Doubtful, or Mistaken Reports. Gro (Lorea 2366, ENCB, cited by Lorea-Hernández & Velázquez M., 1998, but not verified).A
Unverified, Doubtful, or Mistaken Reports. Gro (Lorea 2366, ENCB, cited by Lorea-Hernández & Velázquez M., 1998, but not verified).A
Elevación
600 – 2500 mA
Tipo de vegetación
Wet montane forests.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
Sujeta a protección especial (Pr)C
Discusión taxonómica
Among the indusiate species of Mexican Alsophila, A. firma can be distinguished most readily by the stout black spines on the stipes.A