Monographs Details: Hemionitis
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 short, compact, erect or ascending, scaly; fronds small, monomorphic or slightly dimorphic; stipes hairy to glabrous, castaneous to stramineous, lustrous; blades palmate to pinnate, hairy to glabrous; veins free to netted without included veinlets; laminae herbaceous, glabrous or with acicular or septate hairs on both surfaces; sori along veins for most of their length;indusia absent; spores tetrahedral-globose, tuberculate to cristate; x=30.
Type: Hemionitis palmata
Gymnopteris Bernh., J. Bot. (Schrader) 1799(1): 297. 1799. Type: Gymnopteris
rufa (L.) Underw. [= Acrostichum rufum L.] = Hemionitis rufa (L.) Sw.
Hemionitis is historically limited to the palmate species with
netted veins (five species), but that was shown to be an artificial
separation from Gymnopteris (Mickel, 1974; Giannasi & Mickel,
1979), and the two genera are now generally united. There are
about 10 species, mostly of the Neotropics, with five in Mexico.
However, there is still a problem with generic circumscription,
since H. subcordata, with gymnogrammoid sori, hybridizes in
Colima, Michoca´n, and Nayarit with Cheilanthes skinneri, which
has marginal sori. It seems likely that the genera will have to be
redefined without emphasis on the soral configuration.
Hemionitis is distinguished from Bommeria by its sori extending
nearly the entire length of the veins.