78 
CUMMINGS 
In addition to the stations mentioned above, it was collected by Dr. 
Hayes at Prince William Sound and by Dr. Bean at Port Clarence, 
Alaska, and at Plover Bay, Siberia. 
On bark and dead wood. Associated with species of Physcia , Le- 
cauora, Placodium , and Pyrenula. 
23. Buellia parasema triphragmia (Nyl.) Th. Fr. 
Lecidea triphragmia Nylander, Prod. 141. 1857. 
Buellia parasema triphragmia Th. Fries, Lich. Scand. 590. 1871. 
Orca, 1150 feet (Trelease, 813), St. Michael (Setcliell). New to 
Alaska. 
On Alnus. The thallus is exceptionally smooth and not limited by 
the hypothallus. An examination of numerous specimens shows that 
the thallus is usually smoother when growing on the bark of living 
trees than it is on decaying trees or on the earth. 
Widely distributed ; may occur anywhere. 
In addition to the species named above, Rothrock records the follow¬ 
ing species as having been collected by Dr. Bean: B. albo-atra 
(Hoffm. Nyl.) Th. Fr., at Unalaska; B. atro-alba Fr., on St. Paul 
Island and Unalaska Island and at Plover Bay, Siberia; B. atro-alba 
chlorospora Nyl., on Chamisso Island in the Arctic Ocean. The 
two latter species are given by Tuckerman as synonyms of B. col- 
ludeus (Nyl.) Tuck. J. M. Macoun collected B. alpicola (Nyl.) 
Anz. at St. George Island, also a Buellia , species undetermined. 
Tuckerman records the occurrence of B.parmeliarum (Smrft.) Tuck., 
parasitic on Cetraria fahlunensis, collected by Wright on islands in 
Bering Strait. 
LECIDEA. 
KEY TO THE SPECIES. 
Thallus interspersed with reddish tubercles. panceola. 
Thallus not interspersed with reddish tubercles. 
Apothecia innate... tessellata. 
Apothecia superficial, or if innate, becoming emergent. 
Apothecia innate, becoming emergent. 
Thallus yellowish-white, apothecia medium size ... ...contigua. 
Thallus grayish, apothecia very small. nigrocinerea. 
Apothecia always superficial. 
Thallus smooth. 
Thallus thick. 
Thallus glaucescent... alboccerulescens. 
Thallus orange-red ...... alboccerulescens Jlavocczrulescens. 
