— 5 6 — 
Evernia furfuracea (L.) Mann. Lich. Boh., p. 105, 1826. 
American examples of this plant coming to my notice, include forma nuda 
(Ach.) Cromb., forma scobicina (Ach.) Nyl., forma ceratea (Ach.) Nyl. and var. 
Cladonia Tuck. The species and first two forms are found growing together in 
my region, in fact I have recognized all three in an individual plant. The curious 
fact is to be recorded that all of the Knox County material, and all the material 
from whatever source originating in this country that I have examined, on ap- 
plication of CaCl to the medulla affords a distinct rosy coloration. This is the 
reaction given for Parmelia furfuracea sub-sp. olivetorina (Zopf) Zahl., or Pseu- 
doevernia olivetorina Zopf. If, as I believe it to be undesirable to establish a 
species on chemical criteria alone, the further effort to make such responsible 
for a genus is to be deplored. 
Parmelia trichotera Hue Caus. sur les Parmelia, Jour, de Botanique, 1898. 
Thallus ashy-glaucescent, slate-colored or sometimes blackish, and com- 
monly of a deeper color than P. perlata, K+ tardy reddish, C~, K(C) the color 
vanishes, more or less expanded, orbicular, membranaceous, but somewhat 
rigid, lobed, the divisions medium in width, irregular in shape, contiguous and 
confusedly sub-imbricate, the borders ascendent, crisped, incised-crenate or even 
lobulate, but sometimes rounded and entire at the apices, centrally the borders 
of the lobes invested with sub-globose soredia seated on the tips of dentate 
lobules, without isidia, but sometimes marginally ciliate, above the younger 
lobes appear smooth and somewhat shining at the margins, but the older ones 
are opaque, and rarely rugulose, within white, below black, commonly with 
rhizoids at the centre, but sometimes destitute, here and there rugulose, toward 
the circumference brownish or pale, glabrous and shining. Apothecia short- 
pedicellate, moderate, cup-shaped, disk chestnut, margin entire, the exciple at 
the base rugulose. Spores 20-30 X 11-17 m- 
This is one of the plants that Tuckerman included in his conception of P. 
perlata. The separation of the plant from that species is indeed antagonized 
by certain of the European Lichenists. To my mind the two are distinct, for 
disregarding the difference in reaction, there are others of color, mode of divi- 
sion, and habit. In Knox County the plant is most often found growing on moss- 
covered rocks in shaded places. Appears to be hitherto unnoticed in the United 
States. 
Parmelia farinacea Bitter Untergatt. Hypogym., p. 174. 
Spruce trunks, Rockland. No different from P. physodes, except that the 
surface of the laciniae is more or less granulate and farinose-sorediate. Not 
noticed in American lists. 
Theloschistes ( Xanthoria ) parietinus var. aureola forma congranulata 
Cromb. Grevillea, 1887, p. 78. 
Thallus vitelline or sordid-yellow, spreading somewhat, with concrete 
laciniae, plicated, incised-crenate and naked at the circumference, but centrally 
granulate, the granules obliterating the thallus. Without apothecia. On elm 
trees, Randolph, Kennebec County. Previously unrecorded from America. 
