Phlebodium × hemipinnatum Tejero, Mickel & A.R.Sm., Amer. Fern J. 99(2): 113 (109-116; f.1-2). 2009
Descripción
Phlebodio pseudoaureo atque Polypodio pleurosoro proxima, sed laminis hemipinnatis, id est basis pinnatis apiceque pinnatifidis, plane differt.
Rhizomes long-creeping, 4–6 mm diam. (excluding scales), pruinose, densely scaly; rhizome scales 8–12 X 2–4 mm, ovate, long-attenuate, yellowish brown, each with enlarged, round, peltate base, darker at point of attachment, margins denticulate to short-ciliate and erose throughout, with short to long, flexuous, contorted, hairlike tips; fronds (55)60–70 cm long; stipes 1/3–1/2 the frond length, brown, glabrous; blades ovate-deltate to broadly-oblong, 26–35 cm wide, 1-pinnate at middle basal part, becoming pinnatifid above the middle, terminal segment subconform, 5–16 cm long; pinnae (segments) 8–12 pairs, 12–30 mm wide, linear-oblong to linear-lanceolate, some falcate, acuminate, glabrous, green-yellowish, margins entire to repand; veins netted, free near margins, with 1 row of fertile costal polygonal areoles, each with a single simple or bifurcate, excurrent included veinlet or 2 veinlets that form a secondary areole and meet at their tips, 2–3 rows of similar areoles closer to pinna margins, these mostly without included veinlets; sori round, 2–3 mm diam., submedial, one row on each side of the costa; spores mostly malformed, bilateral, monolete, (33)39(45) X (22)26(33) mm, tuberculate, tubercles domeshaped, somewhat overlapping, amber.
A
Rhizomes long-creeping, 4–6 mm diam. (excluding scales), pruinose, densely scaly; rhizome scales 8–12 X 2–4 mm, ovate, long-attenuate, yellowish brown, each with enlarged, round, peltate base, darker at point of attachment, margins denticulate to short-ciliate and erose throughout, with short to long, flexuous, contorted, hairlike tips; fronds (55)60–70 cm long; stipes 1/3–1/2 the frond length, brown, glabrous; blades ovate-deltate to broadly-oblong, 26–35 cm wide, 1-pinnate at middle basal part, becoming pinnatifid above the middle, terminal segment subconform, 5–16 cm long; pinnae (segments) 8–12 pairs, 12–30 mm wide, linear-oblong to linear-lanceolate, some falcate, acuminate, glabrous, green-yellowish, margins entire to repand; veins netted, free near margins, with 1 row of fertile costal polygonal areoles, each with a single simple or bifurcate, excurrent included veinlet or 2 veinlets that form a secondary areole and meet at their tips, 2–3 rows of similar areoles closer to pinna margins, these mostly without included veinlets; sori round, 2–3 mm diam., submedial, one row on each side of the costa; spores mostly malformed, bilateral, monolete, (33)39(45) X (22)26(33) mm, tuberculate, tubercles domeshaped, somewhat overlapping, amber.
A
Forma de vida
EpífitaA
Ejemplar revisado
Chiapas, Mpio. Tenejapa, a 3.5 km al NE del paraje Balum Canal (16° 48´ 05´´ N, 92° 31´ 50´´ W), Acahual derivado de bosque de Pinus-Quercus, 2200 m, 8 Mar 1995, Ramírez-Marcial & Hernández-Rojas 654 (MEXU!, ECOSUR- herbarium of the Colegio de la Frontera Sur, Chetmul, Quintana Roo, Mexico).A
Distribución
México (país): Chiapas NativoA
Elevación
2200 – 2500 mA
Ecología y Hábitat
Montane areas.A
Tipo de vegetación
Bosque de pino-encinoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
The existence of this new hybrid, with characters intermediate between Phlebodium pseudoaureum and Polypodium pleurosorum, causes us to conclude that the latter species can once again be included in the genus Phlebodium, with the earliest available name, Ph. inaequale T. Moore. Impetus for the recircumscription of polypod genera has been given by several other recent phylogenetic studies on Polypodiaceae, most importantly the one by Schneider et al. (2004), outlining a global phylogeny for the family. Subsequently, several other papers directed toward the placement of problematic Neotropical polypods have appeared (e.g., Krier et al., 2007; Schneider et al., 2006; Tejero-Díez, 2005), are in press (Krier et al., 2008), or have been submitted for publication (Otto et al., in press). The redefinition of Phlebodium also recalls the recent recircumscription of the polypod genus Microgramma, necessitated by the finding of a new and radically different species of the genus in coastal Brazil (Salino et al., in press).
The use of the name Phlebodium inaequale T. Moore for what has been called Polypodium pleurosorum Kunze ex Mett. requires a brief explanation. The former name was published first by Moore (1855), but when treated as belonging in Polypodium cannot be used because of the existence of an earlier homonym, Polypodium inaequale Link, published in 1833 (Mickel and Smith, 2004). A
The use of the name Phlebodium inaequale T. Moore for what has been called Polypodium pleurosorum Kunze ex Mett. requires a brief explanation. The former name was published first by Moore (1855), but when treated as belonging in Polypodium cannot be used because of the existence of an earlier homonym, Polypodium inaequale Link, published in 1833 (Mickel and Smith, 2004). A