990 Wisconsin Academy of Sciences, Arts, and Letters. 
Preissia quadrat a is rather common in the bed of the streams 
which cut the ranges, on rocks just above the usual water course. 
In high water these plants would be submerged. It never 
grows on high banks or dry rocks. It likes the rock crevices 
filled with silt, and favors a rather full exposure to the sun, but 
always insists on getting a drink in torrential storms and rainy 
seasons. It fruits in summer. Asterella tenella has been re¬ 
ported from Minnesota. Grimaldia fragrans and Rehoulia 
Jiemispherica from both states. Oonocephalum conicum, Mar- 
cliantia polymorpha and Preissia quadrata from both states. 
Obdeb 3. Metzgeriaceae. 
5. Riccardia laiifrons Lindb. 
No. 776 Superior, Wis., July 18, 1809. 
No. 659 Carlton, Minn., Sept. 26, 1909. 
No. 1171 Lutsen, Cook Co., Minn., Sept. 1911. 
No. 1136pp Black River, Douglas Co., Wis., Oct. 3, 1911. 
6. Riccardia multifida (B) S. F. Gray. 
No. 1134 Lutsen, Cook Co., Minn., Sept. 20, 1911. 
No. 1097 Brule River, at Winneboujou, May 7, 1911. 
No. 1036pp- Black River, Douglas Co., Wis., Oct. 3, 1910. 
7. Riccardia palmata (Hedw.) S. F. Gray. 
No. 280 Copper Creek, Wis., Aug. 29, 1907. 
No. 1010 Carlton, Minn., Oct. 16, 1910. 
No. 107 Solon Springs, Wis., Aug. 20, 1906. 
No. 1200 Lutsen, Cook Co., Minn., Sept. 23, 1911. 
No. 1039 Black River, Douglas Co., Wis., Oct. 3, 1910. 
8. Riccardia pinguis (L) S. F. Gray. 
No. 1184 Lutsen, Cook Co., Minn., Sept. 1911. 
No. 1099 Brule River, Wis., May 20, 1911. 
No. 1216' Lake Nebagamon, Wis., Sept. 3, 1811. 
9. Pellia epiphylla (L) Corda. 
No. 1012 Black River, Douglas Co., Wis., Oct. 3, 1910. 
No. 1185 Lutsen, Cook Co., Minn., Sept. 1911. 
Duluth, Minn.. Superior, Wis., etc. 
10. Pellia Fal)roniana Raddi. 
No. 1026 Brule River, at Winneboujou. Wis., April 9, 1911. 
No. 1066 Black River, Douglas Co., Wis., Oct. 3, 1911. 
