I 
5 . A LECTORI A, (Ach.) Nyl. 
1. A. jubata, (L.), />. chalybeiformis, Ach. Common on trees, 
rails, and stones. 
a. implexa , Fr. A single specimen only. 
«. THELOSCHISTES. (Norm.) Tuck. 
i- T. clirysophthalmus, (L.) Norm. On dead wood and trees, 
and a very small form on stones. 
b. flavicans, Wallr. Collected by Tuckerman on Nantucket, 
1872. Sterile. 
2. T. parietinus, (L.) Norm. Common on trees and stones. 
3. T. polycarpus, (Ehrh.) On rocks, N. B., and on rail, Peni- 
kese Island. 1873. 
4. T. lychneus, (Nyl.) On rails, N. B., sterile, and on elm, 
Weymouth. 
5. T. COIlCOlor, (Dicks.) On trees, rare. 
b. eff'usa, Tuck. On trees. 
7 . PARMELIA, (Ach.) De Not. 
1. P. perlata, (L.) Ach. On rocks, N. B. and Weymouth, rarely 
on trees. Sterile. The N. B. specimens belong to the var. Cetra- 
rioides , (Del.) 
2. P. perforata, (Jacq.) Ach. On trees. 
* corrugis, Fr. The most common form. According to Mul¬ 
ler, Beitr , n. 1074, this is the oldest name (Fr. Syst., p. 283) for 
P. hypotropa, Nyl. Exsic.. Lojka, n. no. The apoth. are some¬ 
times nearly an inch in diameter. A single specimen found in 
Deerfield swamp, 1883, has the medulla of the thallus saffron- 
colored. 
3. P. cetrata, Ach. On trees. Only found once. 
4. P. Sllbrugata, Kremph. On trees. A single specimen only. 
v P. Cl’illita, Ach-. On trees, but more common on old walls, 
where it is sometimes fertile. 
6. P. till acen, (Hoffm.) Flk. On trees, common, and once on 
stone in wall. 
b. sublcevigata ; Nyl. On trees. 
A very large plant, reaching'eight inches in diameter, on trees, not 
common, Ayas called by Tuckerman P. cetrata , but seems more cor- 
