Ptisana

Ptisana is a genus in the eusporangiate fern family Marattiaceae, comprising species historically treated in the genus "Marattia". The establishment of this genus follows the 2008 work by Andrew G. Murdock, which supported recognition of this group on the basis of genetic analysis and morphology. "Ptisana" can be distinguished from "Marattia" by the presence of distinct sutures at the point of leaflet attachment, deeply cut synangia, and the absence of labiate sporangial apertures. The name "Ptisana" is derived from the Latin word for pearl barley, an allusion to the shape of the synangia.
"Ptisana" has a palaeotropical distribution, with the westernmost extreme of the range in Ascension Island and extending eastward through tropical Africa, Asia, and Oceania. Ferns in this genus are generally quite large, with fronds often reaching 2-3 meters in length; the one known exception to this is "Ptisana rolandi-principis", a dwarf species endemic to the Plateau de Dogny in New Caledonia. The basal chromosome number for "Ptisana" is "2n=78", whereas the one count for "Marattia" in the strict sense is "2n=80". The type species is "Ptisana salicina".