Loxogramme (Blume) C.Presl
Descripción
Rhizomes long-creeping, slender, scaly, bearing densely matted roots; fronds monomorphic (or some dimorphic in OldWorld), small, distant to clumped, pendent; stipes short to nearly absent, not articulate; blades simple, entire, glabrous, fleshy; veins immersed, obscure, netted with included veinlets; sori elongate, oblique to midrib, superficial or in slight grooves; indusia absent; paraphyses absent (in ours) or present; spores green, bilateral or tetrahedral, perispore papillate to shallowly tuberculate; x=35, 36.
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Forma de vida
o Epipétrica. EpífitaA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
There are about 30 species of Loxogramme, most of eastern and southeastern Asia and adjacent Pacific islands, two in Africa and on offshore islands, and only one in Mesoamerica. Copeland (1947) suggested a grammitid alliance for Loxogramme, but Price (pers. comm.) believed it to be a distinct group that is coordinate with polypods and grammitids, perhaps more closely allied to Polypodiaceae s.str. Recent molecular analyses show that Loxogramme and the Australasian genera Anarthropteris (monotypic, New Zealand) and Dictymia (two or three species, eastern Australia and Melanesia) form the basalmost clade within Polypodiaceae, and this clade has no close alliance with Grammitidaceae (Schneider et al., ms. in prep.). The sole Mexican species is rare, growing with, and sometimes confused with, Scoliosorus ensiforme. Loxogramme is characterized by anastomosing veins, clathrate rhizome scales, entire, glabrescent leaves and green spores.A