Lichenes of New England. .301 
well described by Hooker; but Acharius, when he 
published the. Methodus, seems not to have met with 
it in perfection, and his description is, therefore, in 
this respect, incomplete ; while Wahlenberg omits to 
notice it altogether. 
C. bicolor, Ach. Meth., Scher.! 1. c., Moegi & 
Nestl. ! 1. c., De Cand. l. c., Hook. l. c., Parmelia bi- 
color, uin Hees, m ‘bicolor, Hoffm. (cit. 
Spreng. ), Lichen bicolor, Ehrh., Ach. Prodr.— Among 
mosses and other lichens, in the alpine regions of the 
White Mountains. Hooker aptly compares this plant 
to coarse horse-hair. The extremities of the black 
thallus are pnma whence the name.  Infertile. 
SPHIEROPHORON fragile; Ach; E. T. Enum: koc. 
I found this in fruit; abundantly, the last year, on the 
White Mountains. S. coralloides still found barren. 
S. compressum has not yet been discovered. 
SrEREocavLOoN- paschale, Ach. .This seems to be 
now regarded a variable plant, and a disposition is ap- 
parent in late authors, to refer back to it, as the typ- 
ical form of the genus, several of. Acharius's spe- 
cies of Stereocaulon. This species is common with 
us, but I have not elsewhere seen it so fine as in the 
Notch of the White Mountains. A small variety, 
which I have from the summit of Mt. Holyoke, 
seems to deserve some notice. I have also collected 
what I suppose to be the same with this on the 
Medford hills. It is much dwarfed, growing in 
quite close masses or clusters, is considerably granu- 
lated at the extremities of the branches, and the 
