COLLECTED IN AECTIC AMERICA. 



185 



Thej may be tabulated thus : 



Nostochinei 

 Collemei . . 



Caliciei 



Bseom jcei . . 

 Cladoniei ,. 

 Stereocaulei 



Siphulei 



Usneei 



Cetrariei . . 

 Peltigerei ., 

 Parmeliei .. 



GjTophorei 

 Lecanorei .. 

 Lecideini .. 



Graphidei .... 

 Pjrenocarpei 



Total 





G-enera. 



35 



Species. 



108 





Varieties 

 or 



Forms. 



1 . 



1 







2 



3 









1 









1 









14 



49 





1 







^m 



1 







6 



8 



8 



2 



7 



8 



3 



8 



1 



3 



13 



10 



1 



5 



2 



7 



23 



9 



2 



15 



8 



3 



3 







1 



4 







95 



Sir John Richardson has iiindly communicated some informa- 

 tion respecting the formation of the collection, which, with his 

 permission, I here insert. 



'* During our summer travelling, that is from the end of June 

 till the end of August, no lichens were gathered. We seldom 

 landed from the boats oftener than twice a day, and stayed on 

 shore only half an hour at a time, or until our kettle was boiled. 

 This time was spent in the collection of phaenogamous plants ; the 

 immediate banks of the rivers, or at least the spots where landing 

 was convenient, being unproductive of lichens, being either rocks 

 smoothly shaven by the ice borne over them in the spring floods, 

 or thickets of young willows. In the winter-time the terrestrial 

 lichens were deep under the snow till late in June,* and the 

 forests near our winter-houses being of white spruce, yielded no 

 variety of corticolar lichens. On the boat-tracks, frequent fires 

 had consumed the old forest trees, and we had no leisure to ex- 

 plore the depths of the woods. . A few corticolar lichens were got 

 on Lake Superior, where the trees are more various. The terres- 

 trial lichens were gathered at Great Bear and Great Slave Lakes 

 before starting on our summer voyages after the snow had melted j 

 and, from my ignorance of the species of Cladonia, I preserved 

 more specimens than I would otherwise have done, and most 

 likely neglected some that I ought to have taken. The Barren 

 Grounds are densely covered for many hundreds of miles with 



