Asplenium exiguum Bedd.
Descripción
Roots fibrous, not proliferous; rhizomes short-creeping or erect; rhizome scales black, clathrate with occluded lumina, 2.5–3 X 0.5–0.8 mm, entire or nearly so; fronds clumped, 6–18 cm long; stipes castaneous, or sometimes darkened only at the base, 1–5 cm X 0.4–1 mm, 1⁄10–1⁄8 of frond length, sparsely scaly, the scales hair-like or lanceolate, not winged; blades 5–14 X 1.5–2.5(–3.5) cm, narrowly elliptic, 1–2-pinnate-pinnatifid, proximal pinnae gradually reduced, the apices sometimes proliferous, flagelliform; rachises brown proximally, greenish distally, with scattered hair-like scales 1–3 mm long, not winged; pinnae 10–18 pairs, 6–16 X 5–9 mm, apices emarginate, each with a proliferous bud, the buds usually dormant and developing further only in very moist situations, pinnules oblong, subentire to toothed, each one sometimes with a bud at the tip; veins obscure, tips not evident adaxially; indument abaxially of scattered whitish to tan clavate hairs 0.1 mm long; sori to ca. 15 per pinna, on both sides of costae, 1–2(–4) per pinnule; indusia whitish, 1–1.5 X 0.3–0.5 mm, margins suberose to erose; spores reniform; 2n=144 (India).A
Forma de vida
TerrestreA
Ejemplar revisado
Chih (Pringle 833, DS, UC, US). Chis (Breedlove 26979, DS). Coah (Wendt 2046, MEXU). DF (Lyonnet 233, MEXU, NY, US). Dgo (Pringle 10150, MEXU, MO, NY, UC, US). Gro (Sharp 441421, MEXU, US). Gto (Rzedowski 41582, ENCB, IEB). Jal (Bautista 17149, GUAD, UC). Méx (Lyonnet 521100001, MEXU). NL (Cedillo Montoya s.n., 6 Sep 1986, UNL). Oax (Mickel 6488, ENCB, UC). Qro (Rzedowski 46690, IEB, XAL). SLP (Parry & Palmer 1003.5, MO, NY). Son (Lloyd 503, US). Tam (Heredia 00260, ITCV).
Unverified, Doubtful, or Mistaken Reports. Ags (González-Adame 70, HUAA, cited by Siqueiros-Delgado & González-Adame, 2004, but not verified). Hgo (reported by Mickel & Beitel, 1988, but not verified).
A
Unverified, Doubtful, or Mistaken Reports. Ags (González-Adame 70, HUAA, cited by Siqueiros-Delgado & González-Adame, 2004, but not verified). Hgo (reported by Mickel & Beitel, 1988, but not verified).
A
Elevación
1000–2600(–3500) mA
Ecología y Hábitat
On non-calcareous rocks, damp cliffs, and crevices of ledges.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Asplenium exiguum has small proliferous apical buds on the pinnae and sometimes pinnules, and also has subterminal rachis buds, but these are tiny and easily overlooked. The rachises may also become flagelliform and naked when humidity is sufficiently high (Mickel, 1976). No other Mexican spleenwort is so diversified in its means of vegetative reproduction.
The report of this species from Nuevo León by Hinton and Hinton (1994), based on Hinton 20142, applies to A. ultimum. Asplenium exiguum was correctly reported from Nuevo León by Rodríguez-López and Arreguín-Sánchez (1992), citing Sánchez s.n., herb. no. 18919, and Cedillo M. s.n., herb. no. 18931 (both UNL!).
A
The report of this species from Nuevo León by Hinton and Hinton (1994), based on Hinton 20142, applies to A. ultimum. Asplenium exiguum was correctly reported from Nuevo León by Rodríguez-López and Arreguín-Sánchez (1992), citing Sánchez s.n., herb. no. 18919, and Cedillo M. s.n., herb. no. 18931 (both UNL!).
A