172 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
arranged in two series, the smaller ones rosulate, horizontal, mostly sterile, 1.5 to 2.5 
cm. long, the stipe from one-half to one-third as long as the small suborbicular-cordate 
densely pilose lamina; larger fronds two or three, 4.5 to 8 cm. long, stiffly erect or 
somewhat arcuate, the stipe 2.5 to 5.5 cm. long, pilose, slightly paleaceous at the 
base, the lamina 2 to 5 cm. broad and long, suborbicular or very obtusely rounded- 
triangular from a cordate or reniform base, the sinus usually very deep; leaf tissue 
membrano-papyraceous, repand, finely pilose upon both surfaces; midveins lacking, 
the veins coarsely areolate without free veinlets, the elongate areoles pentagonal or 
hexagonal; sporangia following the veins in a thin line throughout. 
Type in the U. 8S. National Herbarium, no. 691252, collected along the road from 
Ojo de Agua to Brasil (Santa Ana), Costa Rica, July 8, 1911, by OtonJiminez (no. 333). 
From the American species of Hemionitis previously known H. otonis is readily 
distinguished by its lesser size and suborbicular leaf blades. 
GYMNOPTERIS. 
Related to Hemionitis is the genus Gymnopteris of Bernhardi! 
founded upon the Jamaican Pteris rufa, or Acrostichum rufum of 
Linneus—Gymnopteris rufa (L.) Bernh. In soft vestiture and in 
type and extent of soriation the several species are not unlike Hemi- 
onitis; they differ mainly in their simply pinnate to subbipinnate 
fronds and free venation. In both Hemionitis and Gymnopteris the 
fronds are subfasciculate from a decumbent or ascending rhizome. 
Underwood? lists two North American species besides the type, 
namely Gymnopteris subcordata and G. ferruginea, which certainly 
must be excluded from this group of species. Both of these are 
discussed hereafter. 
GYMNOGRAMMA. 
The genus Gymnogramme of Hooker and Baker’s Synopsis Filicum 
was treated at some length by Underwood in a paper? already cited. 
As published by Desvaux in 1811,‘ the name was given to an assem- 
blage of 13 species arranged in five groups, according to the subdi- 
vision of their fronds, as pinnate, bipinnatifid, bipinnate, tripin- 
natifid, or decomposite. These species are now apportioned among 
6 or 7 genera, and properly so. In determining the nomenclatorial 
type of the genus Gymnogramma Underwood selected the first named 
species, Gymnogramma rufa (the Pteris rufa or Acrostichum rufum 
of Linneus), in which he is justified by the provisions of the American 
Code, since adopted. Nor is there especial warrant for any other 
decision, although the name has been variously applied by other 
writers in recent years, Christensen even regarding G. flexuosa, 
1Journ. Bot. Schrad. 1799: 297.1799. The name was subsequently used by 
Presl, mainly for a group of species now usually referred to Leptochilus and only 
remotely related to the genus Gymnopteris of Bernhardi. 
? Bull. Torrey Club 29: 627. 1902. 
3 American Ferns, 1V. The genus Gymnogramme of the Synopsis Filicum. Bull. 
Torrey Club. 29: 617-634. 1902. 
*Ges. Naturf. Freund. Berlin Mag. 5: 304. 1811. 
