Acrostichum L.
Descripción
Rhizomes massive, shortcreeping to erect; roots stout, fleshy; rhizome scales thick, blackish brown, to 22 x 2 mm; fronds large, 1-pinnate, each with a conform terminal pinna; pinnae elliptic, entire, coriaceous, glabrous or with minute hairs; veins finely netted, without included veinlets; sori acrostichoid on all or only the distal pinnae, with many capitate paraphyses; indusia absent; spores tetrahedral, whitish tan; x=30.A
Forma de vida
TerrestreA
Distribución
México (Country) native and not endemicB
Ecología y Hábitat
Inhabits marshes, swamps, and stream margins, forming extensive stands 2–5 m tall in fresh or brackish water.A
Categoría IUCN
No incluidaC
Categoría NOM-059-SEMARNAT-2010
No incluidaD
Discusión taxonómica
It is a genus of perhaps as few as three tropical species: one American, one Australasian, and one pantropical. Although thegenus has been generally allied with Pteris, its affinity is not close. It is especially distinct in its acrostichoid sori, many stipe bundles, large fleshy roots, large plant size, marshy habitat, and coriaceous, 1-pinnate fronds. The species are often confused due to their subtle differences. Our descriptions are based on Adams and Tomlinson (1979).A