350 THE MICROSCOPIST. 



Gen. 3. Polybotrya. Veins pinnate, scarcely anastomos- 

 ing. 



Tribe 3. Tcenitidece. Sori linear, extending to the areolse 

 of the leaves. 



Gen. 1. Pleurogramma. Sori contiguous on each side of 

 the rib, parallel, linear, and continuous. Veins simple. 



Gen. 2. Tcenitis. Sori submarginal in middle of disk 

 of leaf, linear, elongated, and continuous. Veins anasto- 

 mosing into meshes. 



Gen. 3. Notholcena. Sori marginal, linear, continuous. 

 Veins pinnate. 



Tribe 4. Grammitidece. Sori linear, confined to the veins 

 or veinlets. 



Gen. 1. Grammitis. Sori linear or roundish, seated on 

 certain arms of the veins. Veins simple or forked, scarcely 

 anastomosing. 



Gen. 2. Selligncea. Sori linear or roundish, on certain 

 arms of veins. Veins much branched and anastomosing 

 without free veins. 



Gen. 3. Synamnia. Sori oblong, on back of lowest 

 venule. Veins branched, anastomosing, with free venules. 



Gen. 4. Meniscium. Sori reniform, on back of trans- 

 verse venules. Veins pinnate, anastomosing. 



Gen. 5. Antrophyum. Sori imbedded on the back of 

 all the veins and venules. Veins branched, anastomos- 

 ing. 



Gen. 6. Hemionitis. Sori on back of veins. Veins 

 branched, anastomosing in regular meshes. 



Gen. 7. Gymnogramma. Sori on back of veins. Veins 

 pinnate or forked, scarcely anastomosing. 



Tribe 5. Vittariece. Sori in the grooved margin, which 

 simulates an indusium. 



