clvi. ADDENDA. 



linear mass, on each side of the costa of the contracted pinnae. 

 Indusium (spurious) formed of the inflexed attenuated margin. 

 Veins simple or forked from a central costa ; venules parallel, 

 free, their apices longitudinally soriferous in the fertile fronds. 



Fronds pinnate, the fertile contracted, resembling those of 

 Lomaria in everything but the position of the receptacles, which 

 are parallel with and not transverse to the veins. Stipes usually 

 furnished with several prominent gland-like bodies (aerophora 

 Metten) at the base; similar bodies often occur also at the 

 base of the pinnse. Caudex thick, short, erect or decumbent. 

 The species composing this genus we had formerly referred 

 to Lomaria, as is done by most authors, but they prove to have 

 the sori arranged as in the Platylomece, namely, in short later- 

 ally contiguous lines along the ends of the veins, and hence 

 have no real structural affinity with Lomaria, in which the 

 receptacle of the sori is linear continuous, and transverse to the 

 reins. We accordingly follow Kunze and Mettenius in separat- 

 ing them. The oblique ring to the spore-case is anomalous among 

 the Potypodinea in which the ring is normally vertical ; and 

 in this peculiarity of structure, but this only, they approach the 

 Cyatheinece. 



Ex. : P. biserrata, Ifetten. \ P. triquetra, Metten. 



P. glauca, Metten, \ P. pycnophylla, Metten. 



