Meniscium Schreb.
Descripción
Rhizomes creeping, stout, often 1–2(–2.5) cm diam.; fronds of most species large, often 100–200 cm long, sometimes subdimorphic; blades 1-pinnate (simple in 2 spp.), each with a terminal often conform pinna, some species bearing buds in axils of proximal or rarely distal pinnae; pinnae entire, or the margins undulate, serrate, or uncinate-serrate; lateral veins of pinnae straight and giving rise to numerous straight, arcuate, or subsigmoid regularly anastomosing secondary veins, producing an excurrent veinlet, thus creating a regular series of areoles between costae and pinna margins); indument of simple hairs, these never stellate, relatively sparse and short, sometimes curved, often confined to costae on both sides and main lateral veins abaxially; sori confluent along the secondary veins and where they join, exindusiate; sporangia glabrous or with setae arising from the stalks or receptacles; x=36.A
Forma de vida
TerrestreA
Elevación
Most species occur at elevations below 1500 m.A
Ecología y Hábitat
Along streams and wet banks.A
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
(Related to the synonym) Subgenus Meniscium comprises about 23 species confined to the American tropics and subtropics, from southern Mexico to northern Argentina and Paraguay, Florida, and the Antilles.
Meniscium is characterized by the regularly anastomosing venation that produces straight and very regular rows of areoles between costae and margins. A few species of subg. Goniopteris have similar venation, but most of these have stellate hairs on some part of the blades, and most have round sori in a bilateral series between main lateral veins and between the costules; the sori are elongate, often lunate along the cross-veins in subg. Meniscium.A
Meniscium is characterized by the regularly anastomosing venation that produces straight and very regular rows of areoles between costae and margins. A few species of subg. Goniopteris have similar venation, but most of these have stellate hairs on some part of the blades, and most have round sori in a bilateral series between main lateral veins and between the costules; the sori are elongate, often lunate along the cross-veins in subg. Meniscium.A