296 Lichenes of New England. 
an interesting account of this lichen in .Hooker's 
.* Appendix to Franklin's Voyage," above cited. It 
is regarded by Gyrophorophagi the best species for 
eating. . I have cited Sprengel for this plant, but the 
reference seems to me to be hardly satisfactory ; I 
shall endeavour to state my .doubts under the next 
species. -The G. deusta of my Enumeration, is, as 
above stated, only an immature, barren form of this 
species. The plant occurs in this condition, not un-- 
commonly, on walls and rocks. : 
G. Muhlenbergii, Ach. 8. alpina: minori, crassiori; 
complicato. — Alpine rocks. Summits of the White - 
Mountains. Chin of Mansfield, and Camel's Rump 
Mountains, Vt. A true alpine form of the — 
analogous to the var. 8. of G. proboscidea: 
G. Pennsylvanica, Ach., E. T. Enum. |. c. I am 
unable to reconcile Sprengel's. diagnosis of this spe- 
cies with that of Acharius, or with the characters of 
our plant. There is the same difficulty in regard to 
G. Muhlenbergii as described by him, and, by other 
authors.. These species resemble each other in many 
points, and it is not, therefore, impossible that they 
may have been by some accident misplaced and con- 
founded. 'The G. Pennsylvanica of my Enumera- 
tion is papulose o; ipper surface, and with cor- 
responding lacu ; the under surface finely 
and regularl like shagreen, without 
ridges or re e apothecia are perfect 
~ patellule, considerably concave, and distinctly mar- 
4. ginated. Now this would seem to be the plant of 
-+ Acharius. So important did he consider the charac- A 
ter of the pat Wa io that he separated A a 
we 
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