CHARACTERS OF TRIBES AND GENERA. 175 



anastomose, but agrees in the sporangia being- seated in a 

 marginal groove. The npper of these is the largest, repre- 

 senting an inJusium analogous to that of Lindswa, with 

 which it is associated in the " Species Filicum," but its 

 very different habit prevents its being associated with 

 Lindscea. It is otherwise peculiar in being the only Fern 

 in Desmobrya having- transverse marginal sori, and com- 

 pound anastomosing venation. 



Sp. D. ^oanamense, Hooh (v v.)., Hooh. Fil. Exot., t. 54. 



Tribe 11.— PLEUROGRAMMEyE (Plate 11). 



Fronds simple, 1 to 10 and 12 inches in length, entire, 

 serrate, rarely dentate or laciniated. Sori linear, transverse 

 costal, or oblong sub-linear, oblique. 



Obs. — This tribe contains about thirty small, and with 

 the exception of a few, grass-like Ferns, and although the 

 character of the sori does not technically differ from 

 Oymnogramme, they nevei'theless are so different in habit 

 that they do not form a natural connection with that 

 genus ; I therefore deem it best to characterise them as a 

 distinct tribe. 



83.— Mo:soGRA3iMA, SchL (1809). 



Veraallon uniserial, sarmentum slender. Fronds simple, 

 distant, linear, graminoid, 1 to 4 inches high. Veinless. 

 Casta sporang-iferous on its disk, or seated in a deep groove 

 on one or both sides, forming a continuous or interrupted 

 linear soris near the apex of the fronds, the margins of 

 which are generally more or less incurved. 



Type. Monogramriia rjraminca, ScJiJc. 



