LICHENS 127 



163. Umbilicaria erosa (Web.) Hoffm. 



Lichen erosits WEBER, Spicil. Fl. Getting. 259. 1778. 



Umbilicaria erosa HOFFMANN, PI. Lichen. 3* : 7. /. 70. 1801. SOWERBY, 

 Eng. Bot. 29. /. 2066. 1809. 



Muir Glacier (Trelease, 1007) ; Kadiak (Trelease, 1009) ; St. 

 Michael (Setchell). Reported from St. Paul and St. George Islands 

 by Macoun. 



Fertile. One of the specimens which was collected at Muir Glacier 

 (ioc>7<$) might perhaps be separated out as forma subradicans Nyl. 



164. Umbilicaria hyperborea Hoffmann. 

 Umbilicaria hyperborea HOFFMANN, Fl. Germ. no. 1795. 



Muir Glacier (Trelease, 1007^) ; summit of White Pass, 3000 ft. 

 (Trelease, 1003) ; Sturgeon River, Kadiak Island (Trelease, 1008) ; 

 Hall Island (Trelease, 1010, 10106) ; Cape Nome (Setchell) ; Sew- 

 ard Peninsula (Collier). In Rothrock's List it is given as col- 

 lected at Plover Bay, Siberia, and at Unalaska by Dr. Bean. It has 

 also been collected on St. Paul Island by William Palmer. 



Fertile. A widely diffused northern form. 



165. Umbilicaria anthracina (Wulf.) Schaer. 



Lichen anthracinus WULFEN in Jacq. Misc. 2. 84. t. g. f. 4. 1781. 

 Umbilicaria anthracina SCHAERER, Helv. no. 154. 1823-1852. 



Kadiak (Trelease, 1005). Sterile. New to Alaska. 



This is an alpine and arctic form which has been reported from 

 Arctic America, Greenland, Newfoundland, and from northern 

 Europe. 



166. Umbilicaria proboscidea (L.) DC. 



Lichen probosddeus LINNAEUS, Sp. PI. 2 : 1150. 1753. Fl. Dan. /. 477. /. j. 

 Umbilicaria proboscidea DE CANDOLLE, Fl. Fran9. 2: 410. 1805. 



Muir Glacier (Trelease, 1007^) ; Unalaska (Setchell) ; St. Matthew 

 Island (Trelease, ion) ; Cape Nome (Setchell). Rothrock reports 

 it from St. Matthew Island, and Macoun from St. Paul and St. 

 George Islands. Under the synonym Gyrophora proboscidea Dr. 

 Nylander records its occurrence on St. Lawrence Island. 



The specimen from Muir Glacier is doubtfully referred here. It 

 is small, with branching fibrils beneath. The development of fibrils 

 on this specimen is much more evident than on the more mature sped' 

 mens. 



