140 
CUMMINGS 
ous mosses. The specimen from Agattu Island is the best developed 
and shows no intermixture of other lichens. All the specimens are 
sterile. A common arctic form. 
The only additional Alaskan species of which I find record is A. 
fremontii Tuck., collected by Dr. Cooley at Sitka and at Salmon 
Creek, near Juneau. 
USNEA. 
KEY TO THE SPECIES. 
Thallus short, tufted. 
Thallus fine, nearly smooth. barbata. 
Thallus coarse, papillate... barbata Jlorida. 
Thallus elongated, pendulous. 
Thallus profusely subdichotomously branched, without spreading 
fibrils. barbata plicata. 
Thallus scarcely branched, covered with spreading fibrils, very much 
elongated..... longissima. 
199. Usnea longissima Acli. 
Usnea longissima Acharius, L. U. 626. 1810. 
Alaska (Dr. Kellogg, 6; Evans, 255 in part) ; Fort Cosmos (Huff, 
a ); Sitka (Setchell, 1259 in part, 1262, 1264); Broughton Strait 
(Trelease, 1184). Tuckerman records it as having been collected in 
Russian America by Dr. Kellogg. 
The specimen collected by Mr. Evans has with it Cetraria glauca , 
Alectoria jtibata , Parmelia physodes and U. barbata plicata. No. 
1259, collected by Professor Setchell at Sitka, is mixed with Alectoria 
jubata. With the specimen from Broughton Strait is the following 
note : “ Strangling evergreens close to the seaside.” Mixed with the 
specimen are fragments of Alectoria and of species of Dicranum and 
Polytrickum . 
200. Usnea barbata Fr. 
Usnea barbata Fries, Sched. Crit. 9: 34. 1824-1833. 
Fraser Reach (Coville and Kearney, 301) ; Broughton Strait, Van¬ 
couver Island (Trelease, 11S4C), with Usnea longissi?na. Both 
specimens sterile. Collected by Dr. Bean, but no definite locality 
given. 
201. Usnea barbata florida (L.) Fr. 
Lichenfloridus Linnaeus, FI. Suec. 1130. 1755. 
Usnea barbata florida Fries, L. U. 18. 1831.— Sowerby, Eng. Bot. t. 872. 
Sitka (Trelease, n 8 o 3 ). A very much dwarfed, sterile specimen, 
which would seem best placed here. New to Alaska. 
