LICHENS 



pilation the record is for the eastern Lake Ontario 

 district already referred to. It is scarcely necessary 

 to remark that as lichens are extremely sensitive to 

 smoke and most gases it is necessary to go outside 

 the city limits and beyond the influence of furnace 

 smoke and factory fumes to find them. 



Family GRAPHIDACEAB. 



Graphis scripta var. limitata Schaer. Trees. Very 



common. 

 Arthonia astroidea Ach. On trees. Common. 



lecideella Nyl. Trees. 



spectabilis Flot. On trees. 



Family GYALECTACEAE. 

 Conotrema urceolatum (Ach.) Tuckenn. Poplar. 



Family LECIDEACEAE. 



Biatora atropurpurea (Schaer.) Mass. Beech. 

 " herengeriana Th. Fr. On earth. 

 " cyrtella (Ach. Nyl.) Tuckenn. Trees. 

 " hypnophila (Turn.) Tuckerm. Bases of 



trees. 

 " laureri (Hepp.) Tuckerm. On beech at 



St. Catharines and Niagara Falls. 

 " rubella (Ehrh.) Rabenh. Trees. 

 " sanguineo-atra (Fr.) Tuckerm. Moss at 



bases of trees. 



" suffusa Fr. On trees throughout Ontario. 

 181 



