LICHENS 143 



208. Cetraria fahlunensis (L.) Schaer. 



Lichen fahlunensis LINNJEUS, Fl. Suec. no. 107. 1755. 



Cetraria fahlunensis SCHAERER, Spicil. 255. 1833. SOWERBY, Eng. Bot. /. 



653. 



Muir Glacier (Trelease, 1 158) ; summit of White Pass (Trelease, 

 1162) ; Kadiak (Trelease, 1134^) ; Unalaska (Setchell) ; Hall Island 

 (Trelease, 1164) ; St. Matthew Island (Trelease, 1163, 1166) ; Cape 

 Nome (Setchell) . Collected on St. Paul Island by Macoun. Roth- 

 rock includes it in his list of species collected by Dr. Bean, but with 

 no indication of special locality. 



Schaerer recognizes two forms, one indicated as a. major, having 

 lobes of the thallus broad and granulate on the margin, the other b. 

 minor, having the lobes of the thallus narrow and scarcely at all granu- 

 late on the margins. No. 1166 is a good example of the first form, 

 and 1164 of the second, while 1158 and 1162 are transition forms. 

 An examination of material in my herbarium from the mountains of 

 New Hampshire and from Labrador shows that both forms are found 

 on the same specimen, and therefore it hardly seems worth while to 

 attempt to discriminate. 



209. Cetraria nivalis (L.) Ach. 



Lichen nivalis LINNAEUS, Fl. Suec. 413. 1755. 



Cetraria nivalis ACHARIUS, Meth. Lich. 294. 1803. SOWERBY, Eng. Bot. 



/. 1994- 



Alaska (Funston, 32) ; Agattu Island (Townsend, 75) ; St. Michael 

 (Turner, 836); St. Matthew Island (Trelease, 1190). Collected by 

 Dr. Hayes at Taku ; by J. M. Macoun on St. George and St. Paul 

 Islands. Under the synonym Platysma nivale (L.) Nylander records 

 its occurrence at Port Clarence. 



The specimen from Agattu Island by C. H. Townsend is a speci- 

 men from the U. S. Fish Commission Steamer Albatross. The seg- 

 ments of the thallus are dwarfed and, at the same time, broader than 

 the common forms. No. 836, from St. Michael, has fragments of 

 Cladonia rangiferina mixed with it. 



210. Cetraria cucullata (Bell.) Ach. 



Lichen cucullatus BELLARDI, App. Fl. Pedem. 1792. 



Cetraria cucullata ACHARIUS, Meth. Lich. 293. 1803. HOFFM. Plant. Lich. 

 /. 66. f. 2. 



Agattu Island (Townsend, 756) ; Unalaska (Setchell) ; St. Mich- 

 ael (Turner, 842; Setchell); St. Lawrence Island (Trelease, 1238, 

 a fragment with Cladonia rangiferina) ; St. Lawrence Island, North- 



