Asplenium formosum Willd.
Descripción
Roots filiform and wiry, fibrous, not proliferous; rhizomes suberect to erect; rhizome scales bicolorous, central portion black, occluded, margins light brown, clathrate, 2–3 X 0.3–0.5 mm, entire; fronds clumped, mostly 10–45 cm long; stipes castaneous to atropurpureous, lustrous, mostly 1–5 cm X 0.5–1 mm, 1⁄10–1⁄5 of frond length, with rare hair-like scales 1–2 mm long and scattered appressed tan hairs 0.1–0.2 mm long, adaxially with tan wings 0.1–0.3 mm wide; blades chartaceous, 1-pinnate, linear, (6–)15–30 X 2–3.5 cm, bases with 5–10 pairs of gradually reduced pinnae, apices pinnatifid, not proliferous; rachises castaneous to atropurpureous, lustrous, with scattered tan appressed hairs 0.1 mm long, adaxially with tan wings 0.1–0.3 mm wide; pinnae oblong, dimidiate, (15–)25–50 pairs, (6–)10–18 X 3–6 mm, sessile, bases inequilateral, apices acute or lacerate, acroscopic margins bidentate or bilacerate, sinuses 1–3 mm deep, distal part of basiscopic margins also often toothed or lacerate; veins 1-forked, tips evident adaxially; indument abaxially of tan, appressed, clavate hairs 0.1 mm long; sori mostly 1–3 per pinna, on basiscopic side of midveins and usually parallel to basiscopic margins, or on both sides and then often 2–3 pairs; indusia 2–5 X 0.5–0.8 mm, margins erose to subentire; spores reniform; 2n=72 (Jam).A
Forma de vida
TerrestreA
Ejemplar revisado
Chis (Breedlove 70707, CAS). Col (Orcutt 4638, DS, NY, US). DF (without collector and number, FCME). Dgo (Gentry 5264, ARIZ, DS, MEXU, MO, NY). Gro (Mexia 8858, ARIZ, CAS, MO, NY, UC, US). Jal (Mexia 1632a, DS, UC, US). Méx (Santiago S. s.n., FCME). Mich (King & Soderstrom 4870, MEXU, NY, UC, US). Mor (Pringle 11255, MEXU, UC). Nay (McVaugh 18915, CAS, IEB, NY). Oax (Mickel 5159, NY, UC, US). Pue (Maldonado s.n., FCME). Rev (Moran 5776, MEXU). Tab (Cowan 3489, UC). Ver (Purpus 2178, MO, UC, US).A
Elevación
50–1250(–2000) mA
Ecología y Hábitat
Especially on rocks near streams.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Asplenium formosum is distinguished from congeners in Mexico by the deeply incised pinna margins, especially acroscopically, and its frequent occurrence on moist rocks by streams at low elevations. It has a remarkably wide distribution, extending to Africa and south India (Moran & Smith, 2001). It is a member of the Asplenium trichomanes group, but is rather isolated within this group and not easily confused with any other species.A