128 CUMMINGS 



167. Umbilicaria cylindrica (L.) Dub. 



Lichen cylindricus LINNAEUS, Afz. Act. Sc. Sv. 1788. 



Umbilicaria cylindrica DUBY, Bot. Gall. 595. 1829. DILL. Hist. Muse. /. 29. 

 f. 116. 



Unalaska (Setchell). Collected by Macoun on St. Paul and St. 

 George Islands, Bering Sea. 



A common and widely distributed northern lichen. 



Additional species of Umbilicaria : Wright collected U. flocculosa 

 Hoffm. at Bering Strait, Macoun collected U. rugifera Nyl. on rocks 

 on St. Paul and St. George Islands. 



Family PARMELIACE^E. 

 PHYSCIA. 



KEY TO THE SPECIES. 



Thallus brown. 



Thallus closely adnate to the substrate, lobes very thin and flat. 



adghitinata. 

 Thallus not closely adnate to the substrate, the tips rounded and 



erect .pulverulenta. 



Thallus gray. 



Thallus granulate or sorediate. 



Lobes of thallus very narrow, granulate at tips tribacea. 



Lobes of thallus rather wide, sorediate cczsia. 



Thallus neither granulate nor sorediate. 



Lobes of thallus rather broad, with white fibrils underneath. 



stellar is. 

 Lobes of thallus narrow, with black fibrils beneath. 



stellar is apiola. 



1 68. Physcia adglutinata (Floerk.) Nyl. 



Lecanora adglutinata FLOERKE in Deutsch. Lich. Lief. 4: 7. 1815. 

 Physcia adglutinata NYLANDER, Syn. 428. 1860. 

 Lichen elcenins SOWERBY, Eng. Bot. /. 2158. 



Muir Glacier (Trelease, 11543). New to Alaska. On Salix with 

 Parmelia olivacea. Specimen fertile. 



Not recorded as occurring in Greenland, Newfoundland, or Lab- 

 rador, but widely distributed to the west and south. 



169. Physcia caesia (Hoffm.) Nyl. 



Lichen ccesius HOFFMANN, Enum. /. 12. f. i. 1784. 



Physcia ccesia NYLANDER, Syn. 426. 1860. SOWERBY, Eng. Bot. /. 1032. 



Yakutat (Trelease, 11393); Farragut Bay (Trelease, 1141); 

 Kukak Bay, Alaska Peninsula (Coville and Kearney, 15 15^ in part) ; 



