Monographs Details: Dennstaedtia
Authority: Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.
Description:Genus Description - Terrestrial; rhizomes creeping or less commonly ascending, usually stout, pubescent, solenostelic; fronds large, often with a bud near the base of each stipe; blades bipinnate to quadripinnate-pinnatifid, chartaceous to coriaceous, glabrous to pubescent; veins free, extending not quite to the segment margins, tips often clavate; sori marginal, without paraphyses, inner and outer indusia forming a cup- or purse-shaped sorus, indusia not greatly modified; spores tetrahedral; x =?
Type: Dennstaedtia flaccida (G. Forst.) Bernh. [= Trichomanes
flaccidum G. Forst.].
Dennstaedtia is most diversified in the Old World (eastern
Asia and the South Pacific), with 20 species in America. In Mexico
it most closely resembles Saccoloma, from which it is distinct
in the hairy rhizome and the sori at the very margin. Dennstaedtia
is probably most closely related to Hypolepis, Pteridium, and
Histiopteris, these four genera occupying a relatively basal position
(in Dennstaedtiaceae) among the higher leptosporangiate
We thank Hugo Navarrete of Pontificia Universidad Cato´lica
del Ecuador, Quito, for reviewing the manuscript and offering