Asplenium delicatulum C.Presl
Descripción
Roots filiform, proliferous and giving rise to new plantlets at long intervals (thus forming colonies); rhizomes suberect; rhizome scales brown, clathrate, obtuse at tips, concave on inner (adaxial) surfaces, 0.5–1 X 0.1–0.3 mm, entire; fronds tightly clustered, 5–15 cm long; stipes brownish green, dull, 1–4 cm X 0.3–0.5 mm, 1⁄4–1⁄3 of frond length, glabrous, with wings 0.1 mm wide; blades membranaceous, 3–6 X 1.5–2.5 cm, 2–3-pinnate, narrowly deltate, widest at bases, apices pinnatifid, not proliferous; rachises greenish, glabrous, with narrow greenish wings 0.1 mm wide; pinnae 4–6 pairs, 1–1.5 cm long, stalked to 2 mm, ultimate segments linear or narrowly elliptic, 0.5–0.8 mm wide, often notched or bifurcate at tips; veins evident, simple, tips evident adaxially; indument abaxially of scattered, appressed, whitish to tan, clavate hairs 0.1 mm long; sori 1 per ultimate segment and usually located at bases of segments near bifurcation of veins; indusia 1–1.5 X 0.5–0.6 mm, margins erose; spores reniform.A
Ejemplar revisado
Chis (Breedlove 48315, 50838, CAS; Dressler 1627, US). Oax (Hernández G. 1483, 1669, CHAPA, MEXU, MO, NY).A
Elevación
300–950 mA
Ecología y Hábitat
On rocks along streams.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Asplenium delicatulum is most similar to very small forms of A. cuspidatum and differs by its much smaller size, thinner blade texture, proliferous roots that produce new plantlets, and very small, ovate, more or less appressed and inrolled rhizome scales. Another close relative is A. tenerrimum, which differs in the more broadly deltate blades, darker, more polished stipe bases, and linear-lanceolate rhizome scales. Throughout its range, A. delicatulum occurs only at relatively low elevations, below 1000 m.
Asplenium cuspidatum Lam. var. triculum Lellinger (Proc. Biol. Soc.Wash. 98: 367. 1985. Type. Costa Rica. San José: Basin of El General, Skutch 4776, US; isotypes F, G) is also very similar to this species and differs primarily by having fronds not borne at intervals along thread-like roots, larger and less dissected blades, and patent pinnae.
A
Asplenium cuspidatum Lam. var. triculum Lellinger (Proc. Biol. Soc.Wash. 98: 367. 1985. Type. Costa Rica. San José: Basin of El General, Skutch 4776, US; isotypes F, G) is also very similar to this species and differs primarily by having fronds not borne at intervals along thread-like roots, larger and less dissected blades, and patent pinnae.
A