CHARACTERS OF TRIBES AED GENERA, 183 
others, form the section Chilopteris of the genus Grammitis 
of Presl, but if he has had true specimens of G. linearis 
under observation, he has not noticed the connecting mar- 
ginal vein which is peculiar to this species, and which has 
also been overlooked by the author of the “Species Filicum ;" 
and, as connecting marginal veins are admitted as of suffi- 
cient value to constitute genera, such as Aconiopteris, Olfersia, 
and Neottopteris, I therefore use this peculiarity in this 
group of Ferns to characterise Lomaphlebia as a distinct 
genus, 
Sp. L. linearis, Swartz, Syn. Fu. (Polypodium gramineum, 
Sw., Fil. Flor. Ind. Occ. ; Hook., Sp. Fil., 4, p. 165). 
Native of Jamaica. 
Tribe 12.—CTENOPTERIDEA (Plate 12). 
Fronds linear, repand sinuose, moniliform or pinnatifid, 
rarely pinnate, or more compound, from an inch to 
a foot or more in length. Veins free, sori punctiform, 
naked. 
Oss.—This tribe embraces a group of small, slender 
Ferns, consisting of about 50 or 60 species, but in many 
cases the difference is so slight that it becomes difficult to 
determine the exact number of distinct species. In the 
* Species Filicum " they are all placed under Polypodium, 
in the section Eupolypodium, which embraces all free- ` 
veined species without regard to the vernation being 
articulate or adherent. They present two forms of 
vernation, the greater portion being fasciculate, forming - 
cespitose tufts, a few being sarmentose, with the fronds 
more or less distant. 
