Pleopeltis constricta Sprunt & Hickey
Descripción
Differing from all other species of the Pleopeltis polypodioides (L.) Watt complex by the contracted pinna bases, at least in the lower part of the blades; this feature renders the blades fully pinnate. In some specimens the proximal pinnae are even short-stalked to ca. 0.5 mm. In older, more mature fronds, this constricted attachment is often associated with a dark, often shiny costa base. Pleopeltis constricta differs from P. acicularis (Weath.)A.R.Sm. & T. Krömer also by the smaller size of its abaxial rachis scales and the lower density of abaxial laminar scales.
Rhizomes 1.6–1.8(1.76) mm diam.; rhizome scales imbricate, lanceolate, 0.7–2.3(1.5) mm long, 0.25–0.5(0.34) mm wide, bicolorous, central band black, sclerotic, 0.3–1.20(0.6) mm long, borders narrow, pale-brown to hyaline, margins strongly serrate; leaves monomorphic; stipes 22–73(51) mm long, covered with lanceolate scales; laminae deeply pinnatisect or narrowly adnate distally, fully pinnate proximally, with 8–13 pinna pairs, pinnae linear-lanceolate to narrowly-elliptic, 43–89(64) mm long, 16–30(23) mm wide, the pinnae constricted and sessile or even short-stalked to 0.5 mm; glands inconspicuous, borne on acroscopic side of the proximal pinnae; venation obscure, veins once-forked; adaxial laminar scales scattered, subulate, 0.17–0.58(0.37) mm long, 0.08–0.23(0.12) mm wide, golden red, bases pectinate-stellate, apices long-caudate, margins weakly erose; abaxial laminar scales imbricate, lanceolate, mostly touching, with some lamina visible, 0.24–0.81(0.5) mm long, 0.13–0.24(0.18) mm wide, bases round, margins undulate, weakly erose, each with a central dark tan to brown band extending into a caudate apex, borders pale tan, orbicular scales also present; abaxial rachis scales imbricate, lanceolate, usually attached at a 45° angle along rachises, 0.5–1.1(0.74) mm long, 0.16–0.34(0.24) mm wide, bicolorous, bases round, apices cuneate, margins weakly erose; sori round to elliptic, uninerved, generally confined to distal half of leaf blade; spores 40–42(41) µm long, 29–31(30) µm diameter.A
Rhizomes 1.6–1.8(1.76) mm diam.; rhizome scales imbricate, lanceolate, 0.7–2.3(1.5) mm long, 0.25–0.5(0.34) mm wide, bicolorous, central band black, sclerotic, 0.3–1.20(0.6) mm long, borders narrow, pale-brown to hyaline, margins strongly serrate; leaves monomorphic; stipes 22–73(51) mm long, covered with lanceolate scales; laminae deeply pinnatisect or narrowly adnate distally, fully pinnate proximally, with 8–13 pinna pairs, pinnae linear-lanceolate to narrowly-elliptic, 43–89(64) mm long, 16–30(23) mm wide, the pinnae constricted and sessile or even short-stalked to 0.5 mm; glands inconspicuous, borne on acroscopic side of the proximal pinnae; venation obscure, veins once-forked; adaxial laminar scales scattered, subulate, 0.17–0.58(0.37) mm long, 0.08–0.23(0.12) mm wide, golden red, bases pectinate-stellate, apices long-caudate, margins weakly erose; abaxial laminar scales imbricate, lanceolate, mostly touching, with some lamina visible, 0.24–0.81(0.5) mm long, 0.13–0.24(0.18) mm wide, bases round, margins undulate, weakly erose, each with a central dark tan to brown band extending into a caudate apex, borders pale tan, orbicular scales also present; abaxial rachis scales imbricate, lanceolate, usually attached at a 45° angle along rachises, 0.5–1.1(0.74) mm long, 0.16–0.34(0.24) mm wide, bicolorous, bases round, apices cuneate, margins weakly erose; sori round to elliptic, uninerved, generally confined to distal half of leaf blade; spores 40–42(41) µm long, 29–31(30) µm diameter.A
Forma de vida
EpífitaA
Ejemplar revisado
Chiapas: Mpio. Ocosingo, 6-8 km North of Ocosingo along road to Bachajon, 900 m, 9 Nov 1971, D. E. Breedlove & A. R. Smith 22122; Linda Vista Tropical Biology Station, Pueblo Nuevo Solistahuacan, 5200 ft [1585 m], 22 Aug 1967, B. T. Gittins 4138 (UC!). Oaxaca: Mpio. San José de Tenango, Sierra Mazateca, 1420 m, 28 Feb 1992, G. Ingela 95-M131 (NY, image seen); Ixtlán-Tuxtepec road, 21–23 km S of Valle Nacional (Km 82–84), 2200–2700 m, 26 Jul 1964, J. T. Mickel 1465 (US, image seen); 76 km N of Ixtlán de Juárez on rte. 175, 5 km S of Vista Hermosa Campamento La Esperanza, 2800–1500 ft [850–460 m], 20 Sep 1973, J. T. Mickel 7197 (UC!). Veracruz: Mpio. Catemaco, cerro Pipiapan, 500 m, 2 Apr 1984, R. Acosta et al. 1521 (CIB!); Mpio. Catemaco, vertiente norte de la sierra de Santa Marta, 830 m, 10 Dec 1982, R. Lira 174 (MEXU!); Mpio. Mecayapan, faldas del volcán Santa Marta, 1400 m, 22 Aug 2006, T. Krömer & E. Otto 2942 (GOET!, MEXU!, UC!); Mpio. Pajapan, cerro San Martín Pajapan, 750–900 m, 3 Nov 1981, M. Nee and J. I. Calzada 22735; Mpio. San Andrés Tuxtla, ejido Ruiz Cortinez, falda del volcán San Martín Tuxtla, 1090 m, 17 Nov 2005, T. Krömer et al. 2703 (MEXU!, UC!); Mpio. Totutla, Zacuapam, Aug 1931, C. A. Purpus 15736 (UC!); Mpio. Zongolica, ejido de Zapaltecatl, 3600–2200 ft [1100–670 m], 21 Jun 1944, J. V. Santos 3055a (MICH,); between Córdoba and Orizaba on Rte.150, ca. 1200 m,15 Aug 1960, J. T. Mickel 746 (MICH).A
Elevación
450 – 2700 mA
Tipo de vegetación
Selva alta, Bosque de neblina/mesófiloA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Note: This new species was discussed in the PhD thesis of Sprunt (2010) in the context of a revision of specimens from the Pleopeltis polypodioides (L.)Watt complex.A