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, Olfe>rsia, 

 and Neottopteris, I therefore use this peculiarity in this 

 group of Ferns to characterise Lomaphlebia as a distinct 

 genus. 



Sp. L. linearis, Swartz, Syn. Fil. (Polypodium gramineum, 

 Sw., Fil. Flor. Ind. Occ. ; Hook., Sp. Fil., 4, p. 165). 



Native of Jamaica. 



Tribe 12. CTENOPTERIDE^E (Plate 12). 



Fronds linear, repand sinuose, moniliform or pinnatifid, 

 rarely pinnate, or more compound, from an inch to 

 a foot or more in length. Feins free, sori punctiform, 

 naked. 



OBS. 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 Eupoly podium, 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 

 caespitose tufts, a few being sarmentose, with the fronds 

 more or less distant. 



