13 
8. C. lligrescens, (Huds.) Ach. On trees in swamps. Exs/c., 
Lojka, n. ioi. 
A small Collema, apparently belonging to this section ( Latha g- 
riuiri) found on elm in Weymouth, 1869, in sterile condition, is inde¬ 
terminable for this reason. 
9. C. pnlposmn, (Bernh.) Nyl. On the earth. Rare. 
10. C. crispUin, Born. On earth about rocks. More common 
than the preceding. 1863. 
22 . LEPTOGIUM, Fr , Nyl. 
1. L. bolacinum, Stizenb. On trees. Rare and sterile. 
2. L. tenuissinmm, (Dicks.) Kbr. On the earth, extending to 
rocks, and once on a Polyporus on tree in swamp, N. B. On wood, 
Weymouth. 1865. 
3. L. lacernm, (Sw.) Fr. On mosses at the roots of trees. 1865. 
/>. lophcEum , Schser. On earth about stones. 
4. L. pillchelluill, (Ach.) Nyl. On trees and rocks, N. B. and 
Weymouth. 1866. 
5. L. treiiielloides, (L . fil.) Fr. On trees. 
6. L. juiliperimun, Tuck.? Among mosses. The specimen 
very scanty and obscure. Another minute Leptogium. hardly ex¬ 
ceeding ^ of an inch of diameter, closely appressed, sterile, with the 
color of L. tremelloid.es , on beech, 1882, is uncertain. 
7. L. cilloromelum, (Sw.) Nyl., b. stellans, Tuck. On trees, 
rare, and only once found fertile. 1867. 
8. L. inyochrouin, (Ehrh., Seiner.) Tuck., a. saturninum. Sch;er. 
On trees. N. B. and Weymouth. Sterile. 
23 . PLACODIUM, (DC.) N<eg. and Hepp. 
1. P. clegans, (Link.) DC. On rocks. 
2. P. murorilin. (Iloftm.) DC. On rocks near the shore, N. B., 
and at Nantasket. 
3. P. ciimaharilllllll, (Ach.) Anz. On stones in a wall west side 
of Chase road. Dartmouth, 18S6, a little south of Kempton street; 
and in similar station. Weymouth. Spermatia minute. 
4. P. micropliyllf 1IUIH9 Tuck. On dead wood, especially of old 
barns. 1879. Weymouth, Nantucket. 
