the known species of Oedogoniacez in English. Dr. Tiffany’s 
extensive acquaintance with American collections, and the 
species found in European exsiccati over a period of fifteen 
years have given him an excellent foundation for a critical 
view of the group. 
It is the hope of the Department of Botany at The Ohio 
State University that this monograph will be followed in the 
near future by a monograph of the Zygnemales, and subse- 
quently of other groups of the filamentous alge. 
EDGAR N. TRANSEAU. 
