COLLECTED IN ARCTIC AMEEICA. 191 



No* 53. 'Forma, gonechay Ach. L. U. Podetiis sursum sensim incrassata. 

 Hab. Great Bear Lake. 



No. 54, Forma podetiis proliferis. 

 Hab. Great Bear Lake. 



No. 55, C. UNCI A LIS, Hoffm.y var. dilacerata, height. 



Hab, Only 4 specimens, 2 from Great Slave Lake ; 2 from Great Bear 

 Lake. 



This is a very remarkable plant, resembling uncialis in form of 

 podetia and colour, but having the lower portion of the podetia 

 split up into long narrow strips, somewhat crenate at the margins, 

 and thus at first sight appearing as large thallodal leaves ; but 

 careful examination shows the true structure. 



Steeeocaulon, Schreh. 

 No. 56. S. TOMENTosuM, Fv.y Tuck. L, Am. Sept. 23, 



Hab. Great Bear Lake. 



Thamnolia, Ack 



No. 57. T. vermicularis, Ach. The taurica form intermixed. 



Hab. Mackenzie's River; Great Bear Lake. (See T. M. Fries, Uchenes 

 Arctoiy p. 161, and Massalongo, de ThamnoUay in Flora, 1856, no. 16.) 



Usnea, Hoffm. 



No. 58. U. barbata. Ft. 

 Forma hirta elongata. 

 Hab. Great Slave Lake. 



No. 5.9. U. barbata, Fr. 



T orxaB, plic at a, Fr. 

 Hab, Great Slave Lake. 



No. 60. U. barbata, Jr. 



Forma ceratinay Schaer. 

 Hab. Great Slave Lake. 



No. 61. U. lacunosa, Willd. {Nyl. Syn. 271). 

 Hab. Great Slave Lake. 



Alectokia, Ach. Nyl 

 No. 62. A. jubata, Ach. 



Torm^ prolixa^ Ach. 

 Hab. Great Bear Lake. 



No. 63. A. jubata, Ach. 

 Porma chalybeiformiSy Ach. 

 Hab. Great Bear Lake. 



