Lindsaea fuscopetiolata A.Rojas & Tejero
Descripción
Lindsaea fuscopetiolata is smilar to L. divaricata but differs in having an anadromic basal pinnule close to the primary rachis and the pinnae are therefore sessile (vs. petiolulate), blade apices that are pinnatifid with a very small terminal segment (vs. subconform, with a lanceolate, undulate, terminal segment), and more pinnules ((14–)20–32 pairs vs. 12–18(–26 pairs per pinna) that are subquadrangular (vs. rectangular) and 1.2–1.5 (vs. 2.0–2.6) times longer than wide.
Perennial, rhizomes short creeping, 1.5–2.5 mm in diameter, with fronds every 1–3 mm distant between them; rhizome scales 1–3 × 0.2–0.4 mm, linear, brown-yellowish to brown, entire; fronds (15–)28–90 cm long, erect; stipes (3–)12–57 cm long, brown to atropurpureous, lustrous, not angulate and not winged abaxially; blade 2-pinnate, deltate to ovate; pinnae (4–)8–15 × 1.2–1.7 cm, (1)2–8 pairs, linear, oblique, sessile, broadly at base, apically pinnatifid or with a small attenuate segment, uniformly spaced and alternates along the rachis, the apical pinnae longer; pinnules 0.5–0.8 × 0.4–0.6 cm, 1.2–1.5 times longer than wide, (14–)20–32 pairs, ascending, dimidiate except the basal ones; sori continuous along acroscopic margin and distal sides of segments; indusia ca. 0.5 mm broad, stramineous, slightly crenate.
Etymology: The name of the new species refers to the brown stipes.A
Perennial, rhizomes short creeping, 1.5–2.5 mm in diameter, with fronds every 1–3 mm distant between them; rhizome scales 1–3 × 0.2–0.4 mm, linear, brown-yellowish to brown, entire; fronds (15–)28–90 cm long, erect; stipes (3–)12–57 cm long, brown to atropurpureous, lustrous, not angulate and not winged abaxially; blade 2-pinnate, deltate to ovate; pinnae (4–)8–15 × 1.2–1.7 cm, (1)2–8 pairs, linear, oblique, sessile, broadly at base, apically pinnatifid or with a small attenuate segment, uniformly spaced and alternates along the rachis, the apical pinnae longer; pinnules 0.5–0.8 × 0.4–0.6 cm, 1.2–1.5 times longer than wide, (14–)20–32 pairs, ascending, dimidiate except the basal ones; sori continuous along acroscopic margin and distal sides of segments; indusia ca. 0.5 mm broad, stramineous, slightly crenate.
Etymology: The name of the new species refers to the brown stipes.A
Forma de crecimiento
HierbaA
Forma de vida
TerrestreA
Ejemplar revisado
Chiapas: Mpio. Ángel Albino Corzo, cerro El Triunfo, 15º37ʹN, 92º48ʹW, 2000 m, 18 February 1997, M. Pérez 1579 (MEXU!).A
Elevación
2000 mA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Lindsaea fuscopetiolata is similar to L. divaricata in having brown to reddish brown stipes and rachises and ascending pinnae and pinnules, but it differs in the characters mentioned in the diagnosis. The pinnatifid apex of L. fuscopetiolata is similar to L. quadrangularis subsp. subalata Kramer (1957a: 190–191) (= L. subalata (Kramer) A. Rojas & Tejero, here combined), but L. fuscopetiolata differs in having brown to reddish brown and lustrous stipes and rachises (vs. brown and opaque), and shorter pinnules (5–8 mm vs. 8–18 mm long) that are 1.2–1.5 times longer than wide (vs. 2.0–2.7 times). Also L. fuscopetiolata has been confused with L. feei Christensen (1906: 393) by its short, sessile pinnae, but it differs in having brown to reddish brown and lustrous stipes and rachises (vs. stramineous and matte), more graduate pinnatifid blade apices (vs. subconform), more pinnule pairs ((14–)20–32 pairs vs. 12–18 pairs), and pinnules with entire margins (vs. lobulated).A