LIST. 
Tribe I. PARMELIACEI. 
1 . RAM ALINA, Ach. De Not. 
1. R. rigida, (Pers.) Tuck. On red cedar and rarely on other 
trees, along the coast, in some localities very abundant; rarely on 
rails and stones. The apothecia now radiate. It varies considerably 
in size, the larger forms being referable to R. grcicilenta, Nvl. -. 
Exsic ., Lojka, Lichenotheca Universalis , n. 105. 
2. R. calicaris, Fr. A common lichen in its various forms. 
a. fraxinea , Fr. On trees. 
b. fastigiata , 1 "!'. On trees and rails. 
c. canaliculata , Fr. On trees, rarely on stones in walls. 
d. farinacea , Schser. On stones in walls, infertile. Larger 
and fertile on trees, Barnstable. A very small plant on shaded 
rocks seems to be a reduced form of this. 
3. R. subfraxinea, Nyl. ? On cedars at Westport Harbor, 1888. 
The specimen found bore but a single small, lateral apoth., with fu¬ 
siform spores, .018-25 by .003-4 mm -> which is not the character 
assigned to those of this species; so that it remains doubtful. 
2 . CETRARIA, (Ach.) Fr., Mull. 
1. C. Island ion, (Ach.) Th. Fr. On sterile soil, north of Acush- 
net cemetery, 1875; and in Dartmouth, Nantucket, and Weymouth. 
Sterile and not abundant. 
2. C. aleurites, (Ach.) Th. Fr. On pitch pine and fences, 1862. 
b. ftlacorodia, (Ach.) Th. Fr. On rails. 
3. C. Fcmlleri, Tuck. On pitch pine and rarely on dead wood, 
N. B., Nantucket, Edgartown 1882, Weymouth 1875. 
4. €. oiliai •is, Ach. On trees, especially white pine, and rails, 
common. A small form occurs on branches of white birch in low 
places. Exsic., Lojka, n. 108. 
5. C. lacunosa, Ach. On rails; and a finer condition, v. Atlan- 
tica Tuck., on white pine; and once on rock. Exsic., Lojka, n. 109. 
