Pteris tripartita Sw.
Descripción
Rhizomes erect, massive; rhizome scales bicolorous; fronds 0.3–2.5 m; stipes ca. 2⁄3 the frond length, glabrous, unarmed, stramineous to brown; blades to 50 cm wide, tripartite, pinnatepinnatifid above the basal pinna pair, basal pinnae pinnatifid beyond the first 1–2 basiscopic pinnules, these exaggerated and pinnatifid; suprabasal pinnae 13–33 pairs, 1–5 cm wide, pinnatisect, the bases truncate, sessile; ultimate segments (2–)4–5 mm wide in the middle, erect or slightly falcate, the apices obtuse to acute, entire or crenulate, or serrulate in sterile segments, chartaceous, subglabrous with sparse minute surface hairs 0.1–0.3 mm; awns often reduced to papillae; veins netted, with one areole between adjacent costules, free near margins; sori continuous along the margins, interrupted at segment apices; indusia entire, paraphyses present; spores reddish brown; 2n=116 (CR, Trin), 2n=232 (Malaya, Java, N. Guinea, Australia).A
Ejemplar revisado
Ver (Sinaca Colin 1506, UAMIZ), possibly naturalized.A
Elevación
180 mA
Ecología y Hábitat
Riverbanks.A
Tipo de vegetación
Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This rare species is distinct by its single areole between costules, truncate pinna bases, and the basal segments of the pinnae being auriculate acroscopically, occasionally also basiscopically.
The nearest records of this species are from Costa Rica and Jamaica.
A
The nearest records of this species are from Costa Rica and Jamaica.
A