76 CUMMINGS 



lease, 936 in part) ; Port Clarence (Trelease, 890) ; Cape Nome 

 (Setchell) ; St. Michael Island (Setchell). Collected on Alaska Pen- 

 insula by Dr. Bean, and on St. George Island by J. M. Macoun. 



All the specimens are on rock and are associated with various spe- 

 cies of Parmelia, Lecanora, Pertusaria, and Lecidea. This is one 

 of the most widely distributed of alpine and arctic lichens. Small 

 bits of the sterile thallus were found with several rock specimens which 

 are not listed above. 



14. Buellia geographica contigua (Schaer.). 



Lecidea geographica a contigua SCHAERER, Spicil. 124. 1828. 



Haenke Island, Disenchantment Bay (Coville and Kearney, 1116) ; 

 Kadiak (Trelease, 897, 898, each in part, 901); Hall Island (Tre- 

 lease, 891, 89 1 a in part). New to Alaska. 



Associated with species of Pertusaria, Lecanora, and Lecidea. 

 No. 1 1 16 has the thallus more distinctly areolate than any specimen in 

 the Tuckerman Herbarium. 



15. Buellia geographica atrovirens (L.)Tuck. 

 Lichen atrovirens LINNAEUS, Spec. PI. ed. 2. a : 1607. 1764. 



Summit of White Pass, 3000 ft. (Trelease, 888, in part) . New to 

 Alaska. 



On rock, associated with Lecanora cinerea gibbosa. 



16. Buellia petraea Tuck. 



Lecidea petrcea WULF. in Jacq. Coll. ill, 116. /. 6. f. 2. a. 1789. 



Buellia petraa TUCKERMAN, Gen. Lich. 190. 1872. SOWERBY, Eng. Bot. 246. 



Broughton Strait (Trelease, 850) ; Plover Bay, Siberia (Trelease, 

 993) ; St. Michael (Setchell). 



The specimen from Broughton Strait is on wood, those from Plover 

 Bay and St. Michael on rock. The species has been recorded by 

 Rothrock from St. Paul Island, from Kadiak and Port Clarence, 

 Alaska, and from Plover Bay, Siberia. 



17. Buellia petraea grandis (Flk.) Tuck. 



Lecidea petrcea ft fuscoatra C. grandis FLOERKE, Flora. 620. 1828. 

 Buellia petraa b. grandis TUCKERMAN, Syn. N. A. L. 2: 102. 1888. 



Alaska, locality lost (Trelease, 968). New to Alaska. Previously 

 reported from Greenland to California and southward. 



Compares well with the specimen in the Tuckerman Herbarium 

 which was collected in the White Mountains of New Hampshire. 



