Asplenium pumilum Sw.
Descripción
Roots thin, fibrous, not proliferous; rhizomes erect; rhizome scales black, clathrate, 1–2 X 0.1–0.3 mm, entire; fronds clumped, 3–20 cm long; stipes castaneous to atropurpureous and sublustrous proximally, greenish or stramineous and dull distally, (3–)5–15 cm X 0.4–1 mm, 1⁄2–3⁄4 of frond length, with scattered to dense, white catenate hairs 0.5–0.8 mm long, not winged; blades membranaceous, deltate to pentagonal, mostly (3–)6–12 X 3–13 cm, pinnate-pinnatifid proximally, apices pinnatifid, not proliferous; rachises green to stramineous, with catenate hairs 0.5–0.8 mm long and greenish ridges or narrow wings 0.1–0.2 mm wide; pinnae deltate, 1–3(–6) pairs, 1–8 X 0.5–4.5 cm, basal pair largest, greatly exaggerated basiscopically, sessile to stalked to 5 mm, lobed at bases, lobes sometimes nearly free, apices longacuminate, margins crenate-serrate; veins mostly 1–3-forked, evident throughout their length on both sides; indument of both blade surfaces, margins, and veins of whitish catenate hairs 0.3–0.8 mm; sori 5–20 on the larger pinnae; indusia 3–9 X 0.5–0.8 mm, margins ciliate; spores reniform; 2n=72 (Jam).A
Forma de vida
Terrestre and epipetricA
Ejemplar revisado
BCS (Brandegee s.n., UC). Camp (Lundell 1228, DS, MO, NY, UC, US). Chis (Breedlove 47100, CAS, NY). Col (Vázquez 1170, UC). Gro (Lorea 2540, FCME). Jal (Pringle 2590, UC). Méx (Hinton 1835, MEXU, US). Mich (Leopo 17082, UC). Mor (Rose & Rose 11078, MEXU, NY). Nay (Jones 23477, CAS, MO, UC). NL (Pringle 2583, CAS, DS, ENCB, MO, NY, US). Oax (Mickel 5821, UC). Qro (Carranza G. 2941, IEB, MEXU). QR (Swallen 2848, US). SLP (Blassingame 1318, US). Sin (Breedlove 35583, CAS, MO). Son (Keil & Canne 8720, NY). Tab (Cowan 1718, CAS, CHAPA, NY). Ver (Dressler & Jones 73, UC). Yuc (Schott s.n., MO, NY).A
Elevación
50–1600 mA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Asplenium pumilum is closely related to A. minimum, differing by the generally smaller fronds, thinner blade texture, and whitish-hairy blades; the two species agree in having the proximal pinnae more developed basiscopically. A few mixed collections of the two species are known, e.g., Hernández G. 891 (CHAPA). Occasional specimens of A. pumilum are completely glabrous, e.g., Mexia 1182 (MO, UC, US), from Jalisco. Relationships of this species group within Asplenium are uncertain.A