Cystopteris Bernh., nom. cons.,
Descripción
Rhizomes slender, short- to long-creeping, scaly; fronds small to medium-sized, monomorphic, not articulate, erect to spreading; stipe slender, brittle, sparsely scaly to glabrescent; blades 1–3-pinnate-pinnatifid; laminae thin, glabrous; veins free; sori abaxial, roundish, indusia hood-like, each attached on the basiscopic side and overarching the sorus, often shriveling or deciduous; paraphyses absent; spores bilateral, dark; x=42.A
Forma de vida
o epipétrica. TerrestreA
Distribución
México (país) Nativo y no endémicoA
Categoría IUCN
No incluidaB
Categoría NOM-059-SEMARNAT-2010
No incluidaC
Discusión taxonómica
Cystopteris is a temperate genus of about 10 species; C. fragilis is generally considered to be cosmopolitan, perhaps the most widespread fern species in the world, but it has not been studied critically in recent years outside of North America and Europe and is probably a complex of several taxa. There are at least three species in Mexico and probably more. Malformed spores have been found in some species, suggesting hybridization within C. fragilis s.l. Relationships of the genus are probably closest with Gymnocarpium, less so to Woodsia (Cranfill, ined.). Cystopteris is distinct by the hood-like indusia.A