Artificial Synopsis of Genera. 



67 



N. 



Indusium near the rn'argin ; fertile frond much 

 contracted, . . . . XII. 



Indusium remote from the margin ; fronds nearly 

 uniform, ... . . XIII. 



O. 



Sori on the upper side of a veinlet, rarely on both 

 sides, ... . . XV. 



Sori confluent in pairs, with an apparently double 

 indusium opening in the middle, . . XVI. 



Sori spread in a stratum on the under surface of 

 the frond, ...... . I- 



Sori roundish, or not more than twice as long as 



broad, . . . .... Q. 



Sori usually linear, always more than twice as 

 long as broad, R. 



Q. 



Stipes articulated to the rhizoma ; fronds (in our 



species) entire or simply pinnate, . . II. 



Stipes not articulated to the rhizoma ; fronds (in 



our species) hi — tripinnatifid or ternate, . XVIII. 



f Fronds narrow, grass-like ... V. 



\ Fronds not grass-like, . . . S. 



Sori marginal, more or less confluent in a mar- 

 ginal band, . . . ... 



Sori following the veinlets, simple, forked, pin- 

 nated, or variously anastomosing. 



IV. 

 Ill- 



T. 



Sporangia opening by a longitudinal slit ; verna- 

 tion circinate, . . .... U. 



Sporangia opening by a transverse slit ; vernation 



straight or inclined, .... X. 



U. 



V. 



r Sporangia ovate, with transverse ring at apex, . V. 



l Sporangia globose without a ring, . . . XXIX. 



( Stems scandent, pinnae palmate, . . XXVI- 



I, Stems not scandent W. 



