98 Tuckerman’s Enumeration of 
Notch. Remarkable for its very spongy fragile fronds, which 
are sometimes large. Both in habit and apothecia it resem- 
bles P. canina, to which Acharius compares it, but Fries con- 
siders it nearest to P. aphthosa. : 
Sricra glomerulifera, (Lightf.) Delis. Stict. p. 129., Fries 
Lich. p. 54., Lichen glomeruliferus, Lightf. Fl. Scot. p. 853; 
Lobaria, Hoffm., Parmelia glomulifera, Ach. Meth., Lich., et 
Syn. — On old trunks, where its very large coriaceous fronds, 
covered with scutelle, are conspicuous. Common in New 
England, and occurring also on rocks. Fries follows Delise 
in referring this, and the allied Parm. herbacea, to Sticta, with 
which genus they agree not only in habit, but also in pos 
sessing cyphelle. These were observed by Delise in S. her- 
bacea, but not in S. glomerulifera; and he even thought it 
doubtful (Hist. Stict. p. 130.,) whether they occurred in the 
latter species, in which moreover, Fries does not seem himself 
to have detected them. Their existence was known however; 
to Mr. Borrer, in whose herbarium I had first. the opportunity 
of seeing a specimen with this development well marked; 
and I have since found them on a Scottish specimen abun- 
dant. Our plant is remarkable for the entire absence of the 
green glomerules, which, though an irregular development 
form a striking feature of the European lichen. ; 
PanwELIA (Imbricaria) incurva, (Pers.) Fries Lich. p. 70» 
Lichen, Pers., Lobaria, Hoffm., P. recurva, Ach. Meth; 
Lichenogr., & Syn. p. 206. — On rocks with P. centrifuga 
in the alpine and subalpine region ; descending also to tbe - 
Notch.  Infertüile. Et 
P. (Imbricaria) ambigua, (Wulf.) Ach. Meth. p. 207., Fri 
Lich. p. 71., Lichen, Wulf., Psora, Hoffm., Lobaria, Hoffm., 
Imbricaria, Decand. — On decaying wood from which the 
bark has fallen ; also on living trunks of firs, and more rarely 
on rocks, White Mountains. Fertile. e 
P. (Imbricaria) aleurites, Ach. — On - decaying woodi 
trunks; and rarely on rocks. Fertile. I have never found 
the fruit except on my specimens from the White Mountains- 
