228 The Ohio Journal of Science [\o\. XXll, No. 7, 



Pediastrum vagum Kiitz. Twin Lake, June 2, 1915. 

 Pediastrum tetras (Ehrenb.) Ralfs. Twin Lake, June 2, 1915. 

 Pediastrum boryanum (Turp.) Menegh. Carp Lake, Emmet 

 Co., Aug. 9, 1915; railroad ditch, Manistique, Aug. 11, 1915. 



SIPHONE/E. 



Vaucheria dillwynii (Web. & Mohr) Ag. Cedar Swamp, on 

 soil, near Douglas Lake, Aug. 17, 1914. (Ruthven.) 

 Reported previousl}^ from Maine and New Jersey. 



Vaucheria sessilis (V^auch.) De Candolle. Pool in swamp, 

 Douglas Lake, Aug. 17, 1914. (Ruthven). 



Vaucheria geminata (Vauch.) DeCandolle. Pool in swamp, 

 Douglas Lake, Aug. 17, 1914. (Ruthven). 



Vaucheria geminata var. racemosa (Vauch.) Walz. Pool in 

 pasture, Douglas Lake, July 13, 1914; Breedsville, June 4, 

 1915. 



Vaucheria geminata var. depressa nov. var. Similar to the 

 type, except that the fertile branch is shorter, and the 

 oogonial branches are longer and depressed, bringing the 

 oogonia down to the level of the main filament or below. 



Filamentis antheridiis et oogoniis ut in typo; ramo sporifero curto," 

 oogoniis 2-4, pedicellatis; pedicellis oogonii longis, recurvatis et depressis. 



New Buffalo, May 31, 1915; previously collected at 

 several stations in central Illinois. In none of these 

 collections have forms been found intergrading with the 

 species. 



Vaucheria orthocarpa Reinsch. New Buffalo, May 31, 1915. 

 Previously reported from California. 



Dichotomosiphon tuberosus (A. Br.) Ernst. Walnut Lake, 

 190G, (Hankinson). 



CLADOPHORACE.^. 



Chaetomorpha chelonium Collins. Walnut Lake, 1906 (Han- 

 kinson). Record based on the type material. 



Rhizoclonium hieroglyphicum (Ag.) Kiitz. White Fish Point, 

 1913 (Hankinson; Holland, June 3, 1915. 



Rhizoclonium crassipellitum W. & G. S. West. Estuary, 

 Holland, June 3, 1915. Although not previously reported 

 from America, the specimens seem best classified under this 

 name. The filaments are unbranched, 40-48ju in diameter, 

 with cell walls 8-12/x in thickness. 



