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. t. 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 Utnbilicaria: Wright collected U. Jlocculosa 
Hoffm. at Bering Strait, Macoun collected U rugifera Nyl. on rocks 
on St. Paul and St. George Islands. 
Family PARMELIACEAL 
PHYSCIA. 
KEY TO THE SPECIES. 
Thallus brown. 
Thallus closely adnate to the substrate, lobes very thin and flat. 
adglutinata. 
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. trilacea. 
Lobes of thallus rather wide, sorediate. ccesia. 
Thallus neither granulate nor sorediate. 
Lobes of thallus rather broad, with white fibrils underneath. 
stellaris. 
Lobes of thallus narrow, with black fibrils beneath. 
stellaris apiola. 
168. Physcia adglutinata (Floerk.) Nyl. 
Lecanora adglutinata Floerke in Deutsch. Lich. Lief. 4: 7. 1815. 
Physcia adglutinata Nylander, Syn. 428. i860. 
Lichen damns Sowerby, Eng. Bot. t. 2ij8. 
Muir Glacier (Trelease, 11543). New to Alaska. On Salix with 
Partnelia 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. t. 12. f 1. 1784. 
Physcia casia Nylander, Syn. 426. i860.— Sowerby, Eng. Bot. t. 1052. 
Yakutat (Trelease, 11393); Farragut Bay (Trelease, 1141) ; 
Kukak Bay, Alaska Peninsula (Coville and Kearney, 1515c in part) ; 
