LICHENS. 285 
Parmelia caperata, L. 
Common on trees, rocks, and boulders. 
Parmelia olivacea, L. 
Frequent on rocks all round the coast. 
Parmelia physodes, L. , 
Rare. On rocks, Jerbourg. Var. labrosa, Ach. Guernsey 
(Crombie). 
Parmelia reddenda, Stirt. 
On tree trunks: generally distributed. It is quite impossible to 
distinguish this lichen from P. Borrert by external characters; but, 
if the white medulla be wetted with hypochlorite of lime, it will 
turn red in P. Borrert, and will remain unchanged in the present 
species. 
Parmelia perlata, L. 
Common on rocks and trees throughout the island. 
Parmelia ciliata, Ny]. 
On the cliffs at Fermain. f. dissectula, Nyl. On rocks at 
the Corbiere. 
Parmelia tiliacea, Ach. 
Guernsey (Salwey). 
Parmelia scortea, Ach. 
Jerbourg, on rocks. 
Parmelia carporhizans, Cromb. 
Near Jerbourg (Crombie). 
Parmelia Borreri, Turn. 
Less common than P. rveddenda. On rocks at Jerbourg. On 
trees, Effards, Catel. 
Parmelia fuliginosa, Dub. 
Rather common on seaside rocks all round the coast. 
Parmelia perforata, Wulf. 
Occasionally on trees and stones in all parts of the island. 
Parmelia conspersa, Ehrh. 
Common on rocks near the sea; also on hedgestones inland. 
f. stenophylla, Ach. On the southern cliffs. f. isidiata, Anzi. 
Mont Cuet. Jerbourg. 
Parmelia sinuosa, Sm. 
Guernsey (Crombie). 
