CATALOGUE OF PLANTS. -oo 



* Var. rudecta, Tuck. 



More frequeotly seen on tree trunks (Eckfeldt). 



P. saxatilis (L.), Fries. 



On rocks and trees. (Eckfeldt) ; — Seal Harbor (Wilson, Eed- 

 field). 



Var. sulcata, Nyl. 



Seal Harbor (Eckfeldt). 



Var. omphalodes, Fries. 



On rocks. Seal Harbor (Wilson, Eckfeldt). 



P. physodes (L.), Acb. 



On rocks. (Eckfeldt) ; — Seal Harbor (Wilson). 

 *Var. obscurata, Acb. 



On rocks. Seal Harbor (Eckfeldt). 



* Var. vittata, Acb. 



On trees. Infertile (Eckfeldt). 

 *P. encausta (Sm.), iNyl. 

 On rocks. (Eckfeldt.) 



P. pertusa (Scbrk.), Schaer. 



On trees and rocks. (Eckfeldt); — Seal Harbor (Wilson). 

 P. colpodes (Acb.), Nyl. 



On tree trunks. (Eckfeldt, Wilson.) 



P. olivacea (L.), Acb. 



On trees. (Eckfeldt); — Seal Harbor (Wilson); — Soutbwest 

 Harbor (M. L. Fernald). 



* Var. aspidota, Acb. 



(Eckfeldt.) 

 Var. sorediata (Acb.), Nyl. 



On rocks. Seal Harbor (Wilson). 

 P. stygia (L.), Acb. 



On rocks. Seal Harbor (Wilson). 



