EAMALINA. 



139 



3. Eamalina peaxinea {fraxinus, the ash- tree). Thallus 

 rigid, shining, reticulate-lacunose, variously laciniated, very 

 rarely sorediiferous ; apothecia vary in site. There are three 

 comparatively well-marked varieties. 



Var. ampliata ; characterized by the breadth and size of 

 the laciniae, which are flattened and somewhat simple, and 

 by the apothecia being lateral and superficial. 



N&v.fastigiata ; distinguished by the apothecia being 

 terminal, and the lacinise, which are shorter and narrower, 

 fastigiate. (E. B. 890.) 



Var. calicaris differs considerably from the others in the 

 tenuity of its lacinise, which are linear, elongated, dichoto- 

 mously ramose, canaliculate, ribbed or smooth ; apothecia 

 terminal, spurred and seated on the deflexed apices of the 

 laciniae. 



This species is one of the most common Lichens, growing 

 on trees and hedges in our forests and on our roadsides. 

 Of its varieties the last is the least frequent ; but all of them, 

 along with the preceding species, frequently grow on the 

 same tree or hedge, and pass by insensible gradations into 

 each other. The oak and ash are probably the most com- 

 mon habitats of the larger forms. Less frequently it grows 

 on rocks, but in this case it is always somewhat dwarfed, 



