LICHENS 



75 



Collected at Cook Inlet by Dr. Bean. 



In addition to the species given above, Dr. Bean collected X. par- 

 allela pallens Nyl. on an island in Cross Sound. 



OPEGRAPHA. 



12. Opegrapha varia Pers. 



Opegrapha varia PERSOON, Ust. Ann. Bot. 7 : 30. 1794. 



Port Wells (Trelease, 835 in part) ; Orca (Setchell, 1218). New 

 to Alaska. 



No. 835 is on the bark of coniferous trees with Biatora cinnabarina 

 and Heterothecium sanguinarium affine. The spores are broader 

 than usual and often 3-septate. Common throughout the United 

 States. 



Family LECIDIACE^I. 



BUELLIA. 



KEY TO THE SPECIES. 



Thallus yellow. 



Areoles of the thallus scattered .geographica atrovirens. 



Areoles of the thallus massed. 



Hypothallus distinct geographica. 



Hypothallus not evident .geographica contigua. 



Thallus never yellow. 

 Spores bilocular. 



Growing on the earth or dead mosses papillata. 



Growing on trees or rocks. 



Thallus smooth, whitish. .parasema. 



Thallus scurfy, variously colored. 



Thallus ash-colored myriocarpa. 



Thallus greenish ash-colored myriocarpa chloropolia. 



Spores plurilocular or muriform-multilocular. 



Thallus brownish or blackish .petrcea. 



Thallus variously colored. 



Thallus ash-colored, apothecia small petrcea grandis. 



Thallus violet-colored, apothecia large petrcea montagnai. 



13. Buellia geographica (L.) Tuck. 



Lichen geographicus LINNAEUS, Spec. PI. ed. 2. 2: 1607. 1764. SOWERBY, 



Eng. Bot. /. 243. 

 Buellia geographica TUCKERMAN, Gen. Lich. 190. 1872. 



Summit of White Pass (Trelease, 951 in part, 95 ia) ; Kadiak (Tre- 

 lease, 899, 900, 902, each in part) ; Hall Island (Trelease, 891*5, 893, 

 each in part) ; St. Matthew Island (Trelease, 999) ; Port Wells (Tre- 



