Asplenium minimum M. Martens & Galeotti
Descripción
Differs from A. pumilum by: rhizome scales longer (2–3 mm) and wider (0.5–0.8 mm), not as hair-like, occasionally denticulate along margins; fronds larger, with stipes often 15–20 cm, blades often 10–15 cm; stipes black abaxially to proximal pair of pinnae and color continuing along proximal part of rachises; pinnae thick, veins obscure; indument essentially absent on stipes, rachises, and veins of both blade surfaces and margins, abaxially glabrous or with scattered, brown, appressed hairs 0.1 mm long on abaxial leaf surfaces; indusia 4–8(–11) X 0.5–0.8 mm, with erose margins, lacking hairs.A
Forma de vida
Terrestre and epipetricA
Ejemplar revisado
Chis (Rovirosa 862, NY, PH). Mor (Rose & Painter 6945, US). Oax (Mickel 7328 p.p., NY, UC). Qro (Fernández N. 3465, ENCB; Rzedowski 48084, IEB, MEXU, XAL). SLP (Pringle 3389, DS, UC). Tab (Rovirosa 862, MEXU). Tam (Palmer 305, NY, US). Ver (Calzada 7943, MEXU, XAL; Purpus 6055, UC).A
Distribución
México (Country) doubtful originB
Elevación
40–950 mA
Ecología y Hábitat
On open banks, shaded limestone ledges.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
The wider rhizome scales (more than 3 cells at bases), thicker blades, lack of catenate hairs and ciliate indusial margins, and longer sori appear to correlate and distinguish Asplenium minimum from the closely related A. pumilum. More collections have been seen from Veracruz (23) than from all other states combined, where A. minimum is uncommon or rare. Several mixed collections of A. minimum and A. pumilum have been found in herbaria, from Oaxaca (Mickel 7328, NY, UC) and Veracruz (Bourgeau 2783, NY; Ventura A. 19852, XAL), and the differences between the two species are readily apparent in these mixed gatherings. Asplenium minimum is based on specimens with juvenile leaves that are precociously fertile, a condition seen in both A. minimum and A. pumilum, as well as many other species of Asplenium. The type is glabrous and appears to be conspecific with much larger specimens cited above, but further study is needed.A