100 Tuckerman's Enumeration of 
plant is mostly white so far as I have seen in all states ; the 
foreign plant is often of this color, but ochroleucous portal 
My Fries. 
P. (Placodium) straminea, Wahl. in Ach. Meth. Suppl., and 
Ach. Lich. p. 432., Fries. Lich. p. 109, Lichen, Wahl. Lapp. 
p. 417., t. 98. f. 1, Lecanora, Ach. Lich. p. 432., et Syn. p. 
180. — Rocks of the Notch, not abundant, but fine and fer- 
tile. This lichen has hitherto been found only on the coasts 
of the Icy Sea, in Finland, Spitzbergen, and Greenland. 
'Though I have seen no authentic specimens of the foreign 
plant, I do not hesitate to refer our Parmelia to it. The 
color of the scutelle, at first reddish brown, becomes almost 
black. We have the species also on the coast, where I have 
several times observed it. 
P. (Placodium) murorum, (Hoffm.) Ach. Meth. p. 1955 
Fries Lich. p. 115., Lichen, Hoffm. , Lecanora, Ach. Liche- 
nogr., Placodium, Decand., Ravi Hook. — Rocks and 
stones near the sea, at Nahant; often in company with P. ele 
gans, and beautiful rock forms of P. parietina. P. saxicola, 
and what I almost think may turn out to be P. oreina, are 
= fine lichens at Nahant. 
P. (Patellaria) oculata, (Dicks.) Fries Lich. p. 135., —4 
Fr. Lichen epibryon, Wahl. Lapp. p. 408. — 8. Fr. Lichen 
oculatus, Dicks., Engl. Bot. t. 1833., Isidium ?. Ach. Meth. p: 
140., Turn. and Borr. Lichenogr.. Brit, p. 103., Hook. Br. Fl. 
Limits Ach. Syn. p. 148., Lichen dectyliferus; Wahl. 
Lapp. p. 414. — Trunks of trees, rare. The description bf 
Borrer, and the figure in English Botany leave nothing to be 
added to the history of this Lichen, And the doubts of the 
English Lichenists respecting its scientific arrangement, al 
confirmed by Acharius's latest judgment, and by Fries. The 
variety 8. is an excellent example of that peculiar anamorpho 
sis of the thallus of Lichenes, which, under the name " 
Isidium, long passed for a distinct genus. 
-.P. (Urceolaria) verrucosa, Fries Lich. p. 186., — a. Urter 
laria, Fr. Lichen. panyrgus, Wahl, Urceolaria, Ach, Meth 
die 
