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 cin?iabarina 
and Heterothechwi sanguinarium affine. The spores are broader 
than usual and often 3-septate. Common throughout the United 
States. 
Family LECIDIACEiE. 
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 co?itigua. 
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. 7 ?iyriocarpa 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 montagncei. 
13. Buellia geographica (L.) Tuck. 
Lichen geographicus Linnaeus, Spec. PI. ed. 2. 2: 1607. 1764 .—Sowerby, 
Eng. Bot. t. 245. 
Buellia geographica Tuckerman, Gen. Lich. 190. 1872. 
Summit of White Pass (Trelease, 951 in part, 951 a) ; Kadiak (Tre¬ 
lease, 899, 900, 902, each in part) ; Hall Island (Trelease, 891£, S93, 
each in part) ; St. Matthew Island (Trelease, 999) ; Port Wells (Tre- 
