192 



THE REV. W. A. LEiaHTON ON LICHEN'S 



No. 64. A. DivERGENs, NyL 



Hab. Great Bear Lake. 



No. 65. A. ocHROLEucA, NyL 



Var. nigricans, Fellm. Lich, Lapp. Or, 52. * ^ 



Hab. Great Bear Lake. 



ErEsyrA, Ach. S( Nyl, 



No. 66. E. PRUNASTRi, Ach. 



Forma thallo albido-flavescente sparsim albo-soredioso. 



Hab. Great Slave Lake; Great Bear Lake; York Factory, Hudson's 



Bav. 



Dactylika, Nyl. 



No. ^1. D. ARCTiCA, NyL 



, Hah. Great Bear Lake; Great Slave Lake. 



Dr. Nylander mentions, in his *Sjn.' p. 286, that he had not 

 seen the spermogonia, which, however, I detected on. the apices 

 and aides of some few of these specimens. They appeared as 

 black specks on slight prominences, internally colourless. 



PLATE 11. 



Fig. 11. Spermogonia nat. size. 

 Fig. 12. Sperraogonium magnified. 

 Fig. 13. Vertical section of spermo 



go ninm 



Fig. 14. Ascus. 



Fig. 15. Spores, magn. 1200 lin, 



Fig. 16. Sterigmata. 



Fig. 17. Spermatia *. 





Eamalika, Ach. Ft- 



No. 68. R. CALiCARis, Fr, 



Forma farinacea {Fr.). Minute specimens. 

 Hab. Great Slave Lake. 



Cetbabia, Ach. Sf NyL 



No. 69. C. ISLANDICA, Ach, 



YormsL platyna^ Ach. 

 Hab. Great Bear Lake. 



No. 70. Forma tubulosa. Schser. Fruit. 

 Hab. Great Bear Lake. 



No. 71. Forma Delisei, Schaer; Fell. Lich. Lapp. Or. 60. 

 Hab. Great Bear Lake. 



Only a single specimen. 



No. 72. Forma crispa, Ach. ; Fell. Lich. Lapp. Or. 59, Fruit. 

 Hab. Great Bear Lake ; Great Slave Lake. 



* Since writing the above, I find that Dr. W. L. Lindsay had described an* 

 figured the sterigmata and spermatia in his elaborate Essay on the Spermogonai 





Boy. Soc. vol. xxii. part 



Gold Medal 



