236 LICHENES. 



P. colpodes, Ach. Trees. 



P. olivacea, Ach. : trunks. — var, panniformis, Nyl. ; 



trunks. — var. sorediata, Nyl. ; trunks. 

 P. stygia, Ach. Rocks. 

 P.- caperata, Ach. Trunks and stones. 

 P. conspersa, Ach. ; rocks and stones.— var. stenophyl- 



la ; rocks and stones. 



P. centrifuga, Ach. Rocks in mountains. 



Physcia ciliaris, var. angustata. Tuck. Devil's den, Wil- 

 loughby Lake. 



P. aquilla. var. detonsa, Tuck. Rocks and trees. 



P. pulverulenta, Fr. ; trunks, — var. pityrea ; trunks. 



P. stellaris, Wahl. ; trunks, dead wood and rocks. — var. 

 astroidea, Ach. ; trunks, dead wood and rocks. — var. 

 tribacia, Fr. ; trunks, dead wood and rocks. 



P. stellaris. Wallr. ; trunks, rocks, etc. — var. aipolia, 



Scha;r. ; trunks, rocks, etc. — var. hispida, Fr. ; trunks. 



rocks, etc. 

 P. cassia, Ach. ; rocks, stones and dead wood. — var. stel- 



lata, Fr. ; rocks, stones and dead wood- — var. tribacia, 



Fr. ; rocks, stones and dead wood. 



P. speciosa, Ach. ; trunk and i^ocks. — var. hypoleuca, 

 Mich. ; trunks. 



P. obscura, Fr. Trunks. 



Pyxine Cocoes, var. sorediata. Tuck. Trunks. 



Umbilicaria Pennsylvanica, Hoflm. Rocks. 



U. pustulata, var. papulosa. Tuck. Rocks. 



U. proboscidea, DC. Stenh. Rocks. Mansfield Mt. 



U. flocculosa, Hoffm. Rocks.; Mansfield Mountain. 



U. Dillenii. Tuck. Rocks. 



U. erosa, Hofim. Rocks ; Mansfield Mountain. 



U. hvperborea, Hoflm. Rocks; Mansfield Mountain. 



U. Muhlenbergii, Ach. Rocks. 



Sticta crocata, Ach. Mossy rocks. 



S. pulmonaria, Ach. Trees and rocks. 



