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.
Graphis scripta var. limitata Schaer. Trees. Very common.
Arthonia astroidea Ach. On trees. Common.
" lecideella Nyl. Trees.
" spectabilis Flot. On trees.
Conotrema urceolatum (Ach.) Tuckerm. Poplar.