Campyloneurum amphostenon Fée
Descripción
Rhizomes moderately long-creeping (>5 mm between stipe bases), pruinose, (2–)3–5 mm diam.; rhizome scales dense, tan to brownish, ovate-lanceolate, 3–6 X (1–)1.5–2.5 mm, clathrate, the cells elongate, at least twice as long as wide; fronds 30–70(–100) cm long, usually somewhat distant (often 5–10 mm apart); stipes mostly 3–10 cm long; 1⁄10–1⁄5 the length of the blades; blades subcoriaceous, narrowly elliptic, (1–)1.7–3.5 cm wide, bases subabruptly tapering, apices acuminate; lime dots absent adaxially; areoles 2–4(–5) rows between midribs and margins, excurrent veinlets 1 or 2 per primary areole; main lateral veins immersed, faintly if at all discernible, secondary veins irregularly anastomosing; sori 2–4-seriate, in ± irregular rows between midribs and blade margins, one or two sori per primary areole.A
Forma de vida
EpífitaA
Ejemplar revisado
Chis (Breedlove 26260, DS, NY). DF (Lyonnet 1634, MEXU). Gro (Rzedowski & McVaugh 258, ENCB, MEXU, NY). Hgo (Sánchez M. 155, US). Jal (McVaugh 10084, MEXU, MICH, NY, US). Méx (Purpus 1841, NY, US). Mor (Lyonnet 471200020, MEXU). Oax (Mickel 3829, NY, UC). Pue (Rzedowski 29998, ENCB, NY). SLP (Schaffner 76, NY). Ver (Ventura A. 7921, ENCB, F, NY).A
Elevación
(1150 –)1750 – 2700(– 3000) mA
Tipo de vegetación
Bosque de neblina/mesófilo, Bosque de pino, Bosque de pino-encino, Selva altaA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
This species is closely related to C. angustifolium, with which it has often been combined. Campyloneurum amphostenon differs from that in having broader blades (and hence more rows of sori between the midribs and blade margins), longer stipes, and longer and wider, lighter colored rhizome scales. We have seen one mixed collection of the two species, Dorantes et al. 5120 (NY), from Edo. Veracruz, Las Vigas, 2200 m, and on this gathering, the differences in rhizome scales and soriation can readily be seen.
Schaffner 76 (NY) is represented by two sheets, one labeled “Valle de México” collected in 1875, the other labeled “San Luís Potosí” with no collection date.
León (1992) recognized C. amphostenon var. irregulare (Lellinger) B. León as also occurring in Mexico, and cited a single collection, from Veracruz: Nee & Hansen 18701 (F).We have not seen this specimen, but doubt its distinctness from var. amphostenon. Var. irregulare (type from Ecuador) was said (by León) to be distinguished by the irregular arrangement of the cells in most of the stem scales; it was ascribed a range of s. Mexico(Ver), Guatemala, Costa Rica, Panama, Ecuador, Peru, and Bolivia by León.
León (1992; in Davidse et al., 1995) cited Mexico in the range of C. densifolium (Hieron.) Lellinger, a species said to occur from Mexico to Bolivia and the Greater Antilles. Campyloneurum densifolium was distinguished by León by light brown, ovatelanceolate (vs. dark brown and lanceolate) subappressed (vs. spreading) rhizome scales generally two times longer than wide (vs. three or more times longer than wide in C. amphostenon); in addition, the cells of the scales were said to be almost isodiametric in C. densifolium (vs. longer than wide in C. amphostenon). The distribution of C. densifolium in Mexico was given by León as Durango (Ownbey & Ownbey 1935, GH, NY, US) and San Luís Potosí (Pringle 3821, BM, F, GH, MO, NY); we have seen both of these gatherings in various herbaria and regard the former as C. ensifolium and the latter as C. angustifolium. There are specimens from southern Mexico, especially Chiapas, that possess some of the characteristics of C. densifolium, but we are not convinced that the species can be distinguished insofar as Mexican specimens are concerned.A
Schaffner 76 (NY) is represented by two sheets, one labeled “Valle de México” collected in 1875, the other labeled “San Luís Potosí” with no collection date.
León (1992) recognized C. amphostenon var. irregulare (Lellinger) B. León as also occurring in Mexico, and cited a single collection, from Veracruz: Nee & Hansen 18701 (F).We have not seen this specimen, but doubt its distinctness from var. amphostenon. Var. irregulare (type from Ecuador) was said (by León) to be distinguished by the irregular arrangement of the cells in most of the stem scales; it was ascribed a range of s. Mexico(Ver), Guatemala, Costa Rica, Panama, Ecuador, Peru, and Bolivia by León.
León (1992; in Davidse et al., 1995) cited Mexico in the range of C. densifolium (Hieron.) Lellinger, a species said to occur from Mexico to Bolivia and the Greater Antilles. Campyloneurum densifolium was distinguished by León by light brown, ovatelanceolate (vs. dark brown and lanceolate) subappressed (vs. spreading) rhizome scales generally two times longer than wide (vs. three or more times longer than wide in C. amphostenon); in addition, the cells of the scales were said to be almost isodiametric in C. densifolium (vs. longer than wide in C. amphostenon). The distribution of C. densifolium in Mexico was given by León as Durango (Ownbey & Ownbey 1935, GH, NY, US) and San Luís Potosí (Pringle 3821, BM, F, GH, MO, NY); we have seen both of these gatherings in various herbaria and regard the former as C. ensifolium and the latter as C. angustifolium. There are specimens from southern Mexico, especially Chiapas, that possess some of the characteristics of C. densifolium, but we are not convinced that the species can be distinguished insofar as Mexican specimens are concerned.A