- 
Lichenes of New England. 253 
gether with its “ rather large apothecia," and the very 
light ash-color of the upper surface, separate the plant 
instantly from the ordinary states of P. canina. Still 
Acharius, in his latest work, referred it to that species, 
and Hooker is *not able at all times to. distinguish 
them.” With the above is found what I take for the 
Peltidea ruféscens of Ach., (the P. canina, f, crispa, 
of Ach. Syn., & Schær. !) Sprengel's Peltigera rufés- 
cens as above cited, is constituted of this and P. spüria ; E. 
and perhaps his arrangement will be found more natural 
than that which proposes to make both these species - 
varieties of P. canina. 
Nepruroma poli; Ach. Lichenogr. Univ., Peltigera 
polaris, Spreng., Peltidea polaris, Ach. Meth., Lichen 
"Grónlándicus, Fl. Dan., L. antárcticus, Jacq., L. árcti- 
cus, L. Alpine rocks. on the side of Mt. Pleasant, 
(White Mts.) abundant and fine; but not: observed 
elsewhere. I have not had the opportunity of com- 
paring this with any specimens of N. polaris, but it per- 
fectly answers the descriptions. N. polaris is, accord- 
ing to Sprengel, an inhabitant of both the arctic and 
antarctic regions of America, but it has never before 
been published as belonging to our United States Flora. 
I took the precaution of gathering abundant ^nt 
and shall therefore be able to exchange. 
N. resupindta. ‘There is a fine station for this lichen, 
in the Notch of the White Mountains ; on the high per- 
pendicular rocks, at - the narrowest m of the pass. 
Seins: Ach. This name is almost universally 
adopted. Yet I cannot satisfy myself that the genus 
