186 THE REV. W. A. LEIGHTON ON LICHENS 



Comicularise and Cetrariae, and where the ground is moist with 

 CladonisB, while the boulders thickly scattered over the, surface 

 are clothed with Gyrophorse ; but the number of specimens of each 

 species in my collection will be no measure of the existing number 

 of plants in any locality. The smaller stones on the gravelly 

 ridges of the Barren G-rounds are covered with lichens ; but as 

 they could not be detached and we could not carry the stones 

 with us, few were gathered. What I did bring home were ob- 

 tained in 1822-23 near Fort Enterprise, and they are named by 

 Sir William Hooker in the Botanical Appendix to Franklin's first 



journey, ^to edition, 1823." 



Valuable and interesting as the collection assuredly is, still, as 

 the foregoing account shows that it professes to be neither com- 

 plete nor comprehensive, it would seem to be mere guess-work to 

 attempt to speculate on the distribution of the lichens further 

 than IS done in the preceding table. 



Three perfect sets of the lichens have been made up ; one for 

 the National Herbarium at Kew ; one for Sir John Eichardson ; 

 and one for my own herbarium. The numbers prefixed to the 

 xxames in the Catalogue correspond with similar numbers on the 

 specimens themselves, and will serve as a guide to future identifi- 

 cation . 



NOSTOC, 



No. 1. N. COMMUNE, Vauch, 



For the connection between Nostoc and Collema see ' Micro- 

 scopical Journal,' vol. i. (new ser.) pp. 13 & 90, and vol. viii. p. 239. 



Leptooium, Fr. 



No. 2. L. TREMELLOIDES, Fr. 



Hab. Great Bear Lake. 



"Without fructification. 



No. 3. L. SATURNINUM, NyL 



Hab. Great Slave Lake ; Great Bear Lake. 



Without fructification. 



No. 4. [N.B. There was another single specimen from Great Slave Lake 



Collema 



a condition to decide.] 



CONIOCTBE, Ach. 



No. 6. C. FURFURACEA, Ach, 



Hab. On decaying moss and branches by a rivulet in a abady pla<^ 

 Bear Lake, Nov. 10, 1825, 



