some Lichens of New England. 95 
is represented abroad by 7 species; here by four. CLADONIA 
has about 25 species in the foreign distriet; itis however no. 
little to say that we can reckon perhaps 18.  Bxowvczs, re- 
duced by Fries to the single species roseus, though common 
in New England, has never occurred to me about the Moun- 
tain. Brarora, a genus, which I hope to have more oppor- 
tunities to study, and which is probably well represented with 
us, has in Sweden and Scotland about 24 species, while we 
can as yet perhaps hardly reckon 8. Lecinea, like the last, 
requiring long observation, has been most thoroughly investi- 
gated in Sweden, where about 39 species are recognized: as 
yet I can reckon only about 13 here ; but this includes proba- 
bly nearly all the more remarkable ones. 
Of the third tribe GRAPHIDEÆ of Fries, there are three 
genera in Sweden and Scotland, two only of which I have 
met with here. Umwnsinrcania has 8 species in the European 
district, and we have 9, two of ours being however peculiar to 
America, O»kenarHA has 5 species abroad, while we can 
reckon 4 as yet known. Lercanacris, scarcely represented in 
the foreign district, is-as yet wholly deficient here. 
Of the fourth tribe CALICIEZ, there are 2 genera in Scot- 
land and Sweden. Perhaps this may be called on many ac- 
counts the most puzzling group of Lichens. "There is certainly 
Done upon which so much labor has been bestowed by eminent 
Lichenists, In this country very few species have been ascer- 
tained, and these almost entirely the commonest and most 
“vious forms. It is not every eye that can see a Calicium ; 
nor are they easily to be found, where the attention is dis- 
tracted by numerous other objects. Of Cosrocvsr there are 
3 species in the foreign district, of which we have probably 
one. Of Carreruw there are about 22 species in Sweden and 
, d, while we have only 5 as yet known. This number 
1s however larger than that given by any American writer. 
The fifth tribe SPHÆROPHOREÆ, contains 2 genera, of 
which we have one. Of SeuxnorHoRoN three species occur 
m Scotland and Sweden. Of these, two are abundant and 
