PLATE II. 

 Lichen-types. 



Crustose forms : 



1. Calicium hypereUum. 



2. Graphis scripta. 



3. Rhwdina oreina. 



Foliose forms : 



4. Endocarpon miniattim. 



5. Collema nigrescens. 



6. Sticta puhnonarla. 



Fruticose forms. 



7. Cetraria Islandica. 



8. Rocella tinctoria. 



9. Usnea harhata. 



1, 2 and 3 are about natural size. 4 to 9 inclusive are some 

 what reduced. 6, 7 and 9 represent only portions of 

 plants. 



