104 Proceedings of the Ohio State Academy of Science. 



Hyphoinycetae. 

 Dermatiaceae. 



Cercospora sp. On the leaves of Decodon verticillatus. Bog 

 plants are rather conspicuously free from parasitic fungi 

 infesting their stems and leaves; but Acer rubrum and 

 Decodon on Cranberry Is. are both badly infested and 

 injured by fungi. 



Lichenes. 

 Gyalectaceae. 

 Gyalecta lutea (Dick) Tuck. On diseased sphagnum. Bog 

 meadow, Cranberry Island. 



Lecideaceae. 



Lecidia uliginosa. On diseased sphagnum, bog-meadow. Cran- 

 berry Island. 



Parmeliaceae. 



Parmelia cylisphora (Ach.) (P. caperata (L.) Ach..) On dead 

 Alnus, forest zone, Cranberry Island. 



P. tiliacea (Hoffm.) Ach. On branch of Alnus, forest zone. 

 Cranberry Island. 



BRYOPHYTA. 



Hepaticae 

 Ricciaceae. 



Riccia fluitans (L.) Occurs in abundance in small pools near the 

 southern end of the bog-meadow on Cranberry Island ; and 

 also in the shallow waters or stranded on the mud at the 

 margin of many of the other islands and the lake shore. 



Metzgeriaceae. 



Pallavicinia lyellii (Hook.) S. F. Gray. Thickly covering the 

 ground over small areas of the drier portions of the forest 

 association, also at the margins of small pools in the thicket 

 and forest zones ; and in areas of diseased sphagnum in the 

 bog-meadow of Cranberry Island. It occurs also on the two 

 smaller bog islands. 



