Pteris longifolia L.
Descripción
Rhizomes short-creeping to suberect, densely clothed with scales at apices; rhizome scales dimorphic, 5–7 mm long, grading to hairs 2 mm long, concolorous, yellow to light brown; fronds 20–100 cm long, clumped; stipes less than 1⁄2 the frond length, stramineous with dense pale scales and hairs; blades 1-pinnate, not pedate, tapering proximally, chartaceous to coriaceous; pinnae (28–)32–70 pairs, articulate, auriculate, entire to crenulate, adaxial surfaces glabrous or with scattered hairs on costae, abaxial surfaces, with dense clear hairs 0.8–1 mm long on veins; awns absent; veins free; indusia 0.5–0.8 mm wide, erose; sporangia mixed with paraphyses 0.3 mm long; spores cream to tan; 2n=116 (Grand Cayman Island, Jam, Peru).A
Ejemplar revisado
Chis (Breedlove 33062, DS, ENCB). Col (López F. et al. 627, ENCB, UAMIZ). Gro (Rzedowski 22785, ENCB, MEXU). Méx (Hinton 3961, MEXU). Mich (Soto 7215, MEXU). Mor (Mendoza 48, UAMIZ). Nay (Maltby 86, US). Oax (Mickel 4012, ENCB, MEXU, NY, UC, US). Pue (Knobloch 706, US). QR (Torres 58, MEXU). Qro (Zamudio Ruíz 6152, IEB). Sin (Hernández & Hernández 523, ENCB). SLP (Pringle 3359, B, MEXU, UC, US). Tab (Matuda 3535, US). Tres Marías Islands (Nelson 4201, US). Ver (Ventura A. 8231, ENCB).
Unverified, Doubtful, or Mistaken Reports. Camp (Martínez S. et at. 28081, MEXU, XAL, cited by Palacios-Rios, 2002a, but not verified). NL (reported by Aguirre Claverán, 1983, but cited plants are P. vittata).
A
Unverified, Doubtful, or Mistaken Reports. Camp (Martínez S. et at. 28081, MEXU, XAL, cited by Palacios-Rios, 2002a, but not verified). NL (reported by Aguirre Claverán, 1983, but cited plants are P. vittata).
A
Elevación
50 – 1900 mA
Ecología y Hábitat
Rocky roadbanks in mesic to dry areas.A
Categoría IUCN
No incluidaD
Categoría NOM-059-SEMARNAT-2010
No incluidaE
Discusión taxonómica
This 1-pinnate, free-veined, awnless species is abundantly covered with scales and hairs on the stipes and rachises and has erose indusia. It is closely related to the Old World P. vittata, which has escaped from cultivation in many parts of the New World (Morton, Amer. Fern J. 47: 7–14. 1957), but it has not been reported previously in Mexico or Central America (Smith, 1981; Stolze, 1981). Pteris vittata can be distinguished from P. longifolia in having fewer pinnae (11–22(–35) pairs vs. (28–)32–70 pairs), pinnae not articulate (vs. articulate), indusia entire (vs. erose), and terminal pinnae more strongly developed.A