Kingdom Plantae Class Polypodiopsida Rank Family | Division Pteridophyta Species H. marginatum Order Polypodiales | |
Genus Hemidictyum
C.Presl 1836 Similar Cystopteridaceae, Eupolypods II, Polypodiales, Onocleaceae, Cystodium sorbifolium | ||
Hemidictyaceae is a family of ferns in the order Polypodiales. Its sole genus is ''Hemidictyum'' , commonly known as the "marginated half net fern." Hemidictyaceae is considered to be a sister family to Aspleniaceae, believed to have diverged during the Cretaceous period.
Contents
The name Hemidictyum was derived from the terms hemi (half) and diktyon (net), from the veins being netted only half-way across the pinnules.
Distribution
Hemidictyum is a native neotropical fern, found in Mexico, the Caribbean, Costa Rica, Guatemala, Honduras, Nicaragua, Panama, French Guiana, Suriname, Brazil, Venezuela, Puerto Rico, Bolivia, Colombia, Ecuador, and Peru.
Species
There is currently only one accepted Hemidictyum species name, Hemidictyum marginatum. The other names are considered to be synonyms, either of that species, or of accepted Asplenium species:
Phylogenic relationships
The following diagram for the eupolypods II, based on Lehtonen, 2011, and Rothfels & al., 2012, shows a likely phylogenic relationship between the Hemidictyaceae and the other families of the eupolypods II clade.