above a bank wall, south side of the road in Acushnet, east oi the 
bridge, 1875, from which it has now disappeared. The same was 
also sent me from Illinois by Mr. J. Wolf. 
2. P. pluBOCOCCa, Tuck. On rocks, 1869, and what seems the 
same on the earth. Rare. 
3. P. subfuliginea, Nyl. On rocks, rare. Separated by Nyl. 
from specimens sent him as P. phoeococ.ca. 
4. P. haeinateella, Nyl., Flora 1877, p. 457, 1S82, p. 455 - Japan. 
p. 103. On rocks, rare. Spores spuriously bilocular. 
5. P. phylliscina, Tuck. On rocks, Cornell’s ledge, 1870, and in 
Quincy. Very rare. Under the influence of iodine the spores be¬ 
come pale brown, and faintly 1-2 septate. Remarkable for its needle- 
shaped spermatia. Nyl. in Japan, p. 102, says it seems to be sepa¬ 
rable as a subgenus Amphopsis. 
6. P. flirfurella, Nyl., Sc and., p. 2S. On rock in railroad cutting 
near East Weymouth, and on stones, mostly in wet places, N. B., 
1870. The same as P. corallina , Willey, in Tuck. Syn. I, p. 137, 
fide. Nyl., Japan, p. 102. 
[P. pertenella, (Magmopsis, Nvl. Flora, 1S75, p. 102,) has oc¬ 
curred to me at Grand Manan. P. hauualea, Nyl.. and P. Flotow- 
iana, Hepp., occur in Alaska, jide Nyl., Bc.hr. pp. 6. 17. 6S.] 
20. OMPHALARiA, Dur. and Mont. 
I. 0 . pliyllisca, Tuck. On rocks. 1S63. 
21 . COLLEMA, Iloffm., Fr. 
1. €. pycnocarpuill, Nyl. On trees, N. B., rare, and Wevmouth. 
1866. 
2. €. cyrtaspis, Tuck. On trees, very rare, and sterile. 1867. 
3. C. microphylluni, Acb. On a large elm near Whitman’s pond. 
Weymouth. 1S65. 
4. C. vemiciforme, Nyl. On red cedar and other trees. N. B. 
and Weymouth. 1866. 
5• C. leptalciim, Tuck. On ash in swamps. 1867. 
6. C. inicroptychiuin, Tuck. Found scantily and sterile on an 
elm in Weymouth. 1871. 
7. €. flaccid mil, Ach. On trees and rocks, N. B. and Wevmouth 
