Asplenium sessilifolium Desv.
Descripción
Roots wiry, fibrous, not proliferous; rhizomes erect; rhizome scales black to dark brown, clathrate, 2–3(–5) X 1–1.3 mm, with occasional teeth; fronds clumped, mostly 25–45 cm long; stipes dark reddish brown, dull, 3–10 cm X 0.5–1 mm, 1⁄6–1⁄4 of frond length, glabrous except for basal scales, with narrow wings 0.1 mm wide; blades herbaceous, mostly 20–40 X 2.5–5 cm, pinnatepinnatifid, pinnatifid at apices, most blades terminating in small scaly buds, linear-lanceolate, tapering proximally, stalked to 1 mm; rachises castaneous, dull, glabrous, adaxially with wings 0.1–0.2 mm wide; pinnae 22–50 pairs, 1.3–2.5 X 0.5–1.5 cm, sessile or stalked <1 mm, the most developed each with a single obovate or flabellate, nearly free superior basal segment, apices acute to acuminate, margins bicrenately toothed, crenate-serrate towards tips; veins mostly 5–8 pairs per pinna, simple except in basal acroscopic lobe, tips evident adaxially; indument abaxially of scattered, appressed, tan, clavate hairs 0.1–0.2 mm long; sori 2–8 pairs per pinna, on both sides of midveins, 0–3 on superior basal segments; indusia 1.5–3.5 X 0.4–0.6 mm, margins entire; spores reniform; 2n=72 (Chis, var. sessilifolium).A
Distribución
México (Country) native and not endemicB
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Key to the Mexican Varieties of Asplenium sessilifolium
Pinnae lanceolate, acute to acuminate at tips; pinnae ± deeply incised along acroscopic margins................................................................................................ var. occidentale.
Pinnae oblong, obtuse at tips; pinnae generally shallowly incised except for a single basal segment. ..................................................................................var. sessilifolium.
A
Pinnae lanceolate, acute to acuminate at tips; pinnae ± deeply incised along acroscopic margins................................................................................................ var. occidentale.
Pinnae oblong, obtuse at tips; pinnae generally shallowly incised except for a single basal segment. ..................................................................................var. sessilifolium.
A