444 INDEX TO AMERICAN BOTANICAL LITERATURE 
Underwood, L. M. American ferns-VIII. A preliminary review of 
the North American Gletcheniaceae. Bull. Torrey Club 34: 243- 
262. f. 2, 2. t0 Jl 1907. 
Includes descriptions of 4 new species of Dicranopteris, 
White, J. Atlas of Canada. 1-14. pl. 1-83. Ottawa, ‘‘1906”’ 
[1907]. 
Includes maps showing distribution of forests and forest trees. 
Wittrock, V.B. Zinnaea borealis L. Species polymorpha et poly- 
chroma, Linnaea borealis L. En mangformig Art. Act. Hort. 
Berg. 4’: 1-187. p/. 1-17 +f, 1-78. 1907. 
Includes many references to American forms. 
