Asplenium tenerrimum Mett. ex Kuhn
Descripción
Roots filamentous, fibrous, not proliferous; rhizomes suberect; rhizome scales black, clathrate, hair-like, 1.5–2 X 0.1–0.3 mm, entire; fronds clumped, 4–12 cm long; stipes atropurpureous at bases, lustrous, bicolorous above bases, but often blackish abaxially, 1–5 cm X 0.2–0.6 mm, 1⁄3 of frond length, glabrous, with greenish wings 0.1 mm wide; blades membranaceous, 3–5 X 2–3.5 cm, 3–4-pinnate, deltate, widest proximally, apices pinnatifid, not proliferous; rachises green or bicolorous for 1⁄2 their length, glabrous, with wings 0.1 mm wide; pinnae deltate, 3–5 pairs, 2–3 x 0.6–1.5 cm, 2–3-pinnate in larger fronds, ultimate segments linear or narrowly obovate, 0.5–0.8 mm wide, toothed near tips; veins simple, readily visible on both sides, but not ending in widened tips adaxially; indument abaxially of inconspicuous, tan, clavate hairs 0.1 mm long; sori 1 per ultimate segment, at bases of segments near vein fork; indusia 0.8–1.2 X 0.3–0.4 mm, margins erose; spores reniform.
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Forma de vida
Terrestre and epipetric.A
Ejemplar revisado
Chis (Breedlove 37593, DS; Ramos s.n., MEXU). Gro (Lorea 2579, FCME). Jal (Lott 1386, UC). Méx (Tejero-Díez 3021, IZTA). Mich (Nakamura 123, IEB). Nay (Ferris 5360, US; Wright 1360, US). Oax (Mickel 6900, NY). Sin (Breedlove 35642, CAS, MO; Mexia 257, CAS, MO, UC).
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Elevación
50–900 mA
Ecología y Hábitat
Along river banks and road banks.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
This small, 3(–4)-pinnate species is similar in dissection and size to Asplenium delicatulum but differs in many details. Asplenium delicatulum has stipes green proximally, entire indusia, sori that are located midway on the ultimate segments, and shorter brown, retiform rhizome scales 0.5–0.8 mm long. It spreads by means of slender, stolon-like roots, which are absent in A. tenerrimum.A