Lichenes -o ^ New. England. 251 
even in Lapland he. ec | T c» discover that of C. 
nivalis ; and in the present species it seems to be equally 
scarce in Englaüd and. other eeke countries ; though 
I have selected ample s specimens from the imported stóck 
of an apothecary. If any where in New England, we 
might hope to find it at the White Mountains. 
C. viridis, Schwein. in Hals., Port. in Mass. Cat. 
Abington, Porter, and Cambridge, where it occurs not 
very uncommonly. I have always found it on old rails, 
in company with CC. ciliaris and lacunósa. It seems 
to form with these species, a very natural group ; and so 
far as these three species are concerned, peculiar, if I 
mistake not, to America. . 
BonnERA nes Ach. Linbesidr. Univ., Scher. ! 
Hook., Hals., Parmelia tenella, Ach. Meth,, Snnt á 
Lichen hispidus, Hoffin., L. ciliaris, 2, Huds. Bark of 
old elms, Cambridge, not uncommon ; and in fruit, not 
rare. This species was first published as American in 
Halsey’s View. As there remarked, its habit is very 
much that of a Parmelia, and in the Methodus it is not 
grouped with the other species, afterwards separated to 
constitute Bórrera. 
B. cilidris, Ach. Lichenogr. Univ., Scion ! Hook., 
Muhl., Torr., Parmélia ciliàris, Ach. Meth. Cambridge, 
on udak rare. The prèsence of marginal fibres, all 
more or less black, and very black at the apices of the 
lobes, together with the white, channelled and somewhat 
powdery under side, led ine at first to refer this lichen to 
B. leucómela. From this it differs in the light-green | 
hue of its upper surface, and the presence on the same 
surface of raised black dots. ‘These last form one of the 
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