Lichenes' of New England. 249 
obscure lichen. The apothecia (appearing black to the 
naked eye), are dark-brown. 
L. dibia, Turn. and Borr. in Hook., Lichen dübius, 
E. Bot. t. 2347.. Old rails, with the det Cambridge. 
L. pinicola, Borr. in Hook., L. paraséma, f, and 9, 
Ach. Syn., (sec. Borr.), Parmélia exígua, 8, Ach. Meth., 
Lichen pinícola, Ach. Prodr. (not Meth. as cited in 
Hook.). Scaly bark of old pine trees, as found hy Ach- 
arius and Borrer; Cambridge. | 
Of the Lecide of this vicinity, I have a number un- 
determined, and many doubtless remain to be dis- 
covered. Eleven species are enumerated in the Mass. 
Cat., some of which being common every where, d do not 
phos shy: mention here. 
-Lecandna: iid siiile ree Univ., ‘Schaw: P 
— Hals. Alpine rocks on Mt. Mibi» abundant. A 
very handsome species, 
L. fulva, Schwein. in Hals. (cum Ic. » Mids, Cat. 
Old Elms; Cambridge. Not uncommon in this region. 
Twelve other species of this genus, no less difficult, and 
hardly: less extensive than the last, have been found in 
this vicinity. . 
 Squamanria rubina, Hoffm. (cit. Scher.) Lecanóra. 
chrysoléuca, Ach. Syn., Parmélia. chrysoléuca, Ach. 
Meth., Lichen chrysoléucus, Smith. Cambridge, Wa- 
uom; on rocks; rare.- This is a remarkable form, 
and with SS. crassa, lipària, and Smithii, form a natural 
group well distinguished from the true Lecanóre. Thal- 
lus composed of closely aggregated thick segments, the 
whole often half an inch through, of a light green above, 
