Asplenium muenchii A.R. Sm.
Descripción
Roots relatively coarse, fibrous, not proliferous; rhizomes suberect; rhizome scales black, clathrate, 3–4 X 1–1.3 mm, with occasional small teeth; fronds clumped, 25–50 cm long; stipes castaneous to reddish brown, dull, 3–9 cm X 1–2 mm, 1⁄10–1⁄4 of frond length, glabrous, with adaxial wings 0.1 mm wide; blades thin-chartaceous, (17–)25–40 X (3.5–)5–9 cm, elliptic to narrowly elliptic, apices attenuate, each blade with a proliferous bud near apex, 2-pinnate-pinnatifid to 3-pinnate; rachises graybrown, dull, glabrous, with adaxial wings 0.1–0.3 mm wide; pinnae broadly lanceolate, 20–25 pairs, to 5 X 2 cm, lowest somewhat deflexed, sessile, inequilateral, pinnules more developed acroscopically, costae winged, pinnules spreading to often somewhat ascending, ultimate segments ca. 1 mm wide, falcate, cuneate; veins forking, tips evident adaxially; indument abaxially of scattered, appressed, light tan hairs 0.1 mm long on veins and tissue between veins, blades essentially glabrous; sori one per ultimate segment; indusia whitish to tan, mostly 1–2(–3) X 0.4–0.6 mm, margins entire; spores reniform.A
Forma de vida
Terrestre or epipetricA
Ejemplar revisado
Chis (Breedlove 6222, DS, ENCB, US, 33648, DS). Gro (Hinton 14302, ARIZ, LL, MO, NY, TEX, US; Martínez S. 7526, CAS, MO, XAL). Jal (Díaz L. 6549, UC, US). Méx (Hinton 2389, BM, K, NY, 8941, ARIZ, MO, NY, US). Mich (Rzedowski 46275, ENCB, MEXU, TEX, XAL). Mor (Lyonnet 2876, U). Oax (Mickel 3818a, NY).A
Distribución
México (Country) endemicB
Elevación
1300–2800 mA
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
Citation of Guatemala in the range of A. muenchii by Mickel and Beitel (1988: 64) is based on a misidentification of A. sessilifolium (Heyde & Lux s.n. [Donn. Sm. 4670], NY, an isosyntype of A. sessilifolium var. guatemalense).
This species has often been misidentified as A. myriophyllum, which has more fusiform terminal segments and nonproliferous blades. Asplenium muenchii is more closely allied to A. sessilifolium, which is only pinnate-pinnatifid rather than 2-pinnatepinnatifid to 3-pinnate.
Adams (in Davidse et al., 1995) also recognized A. cladolepton Fée (Mém. Foug. 7: 55, t. 22, f. 4. 1857; type from Colombia, Schlim 324) as occurring in Chiapas and southern Mexico. Specimens of A. cladolepton from Colombia and Venezuela differ from A. muenchii in having narrower blades and lacking buds or plantlets in the axils of distal pinnae, and the resemblance seems to us the result of convergence. However, two of the three Chiapas specimens cited here (including Breedlove 6222, DS, the specimen cited as A. cladolepton by Adams) lack buds (all other specimens cited above bear rachis buds). For now, we maintain the name A. muenchii for Mexican specimens, and exclude A. cladolepton from the Mexican flora.
A
This species has often been misidentified as A. myriophyllum, which has more fusiform terminal segments and nonproliferous blades. Asplenium muenchii is more closely allied to A. sessilifolium, which is only pinnate-pinnatifid rather than 2-pinnatepinnatifid to 3-pinnate.
Adams (in Davidse et al., 1995) also recognized A. cladolepton Fée (Mém. Foug. 7: 55, t. 22, f. 4. 1857; type from Colombia, Schlim 324) as occurring in Chiapas and southern Mexico. Specimens of A. cladolepton from Colombia and Venezuela differ from A. muenchii in having narrower blades and lacking buds or plantlets in the axils of distal pinnae, and the resemblance seems to us the result of convergence. However, two of the three Chiapas specimens cited here (including Breedlove 6222, DS, the specimen cited as A. cladolepton by Adams) lack buds (all other specimens cited above bear rachis buds). For now, we maintain the name A. muenchii for Mexican specimens, and exclude A. cladolepton from the Mexican flora.
A