232 The Ohio Journal of Science [Vol. XVII, No. 7, 



of three layers, median layer scrobiculate ; male fila- 

 ments somewhat smaller than the female; antheridia 

 1-5-celled, frequently alternating with vegetative cells; 

 sperms two, division horizontal; basal cell of filament 

 elongated; terminal cell obtuse. 



Diam. veg. cells, female, 28-48ai; length 40-100^ 

 Diam. veg. cells, male, 24-30m; length 40-100/x. 

 Diam. oogonia, 40-76/^; length 48-70^. 

 Diam. oospore, 38-74/i; length 46-56/i. 

 Diam. antheridial cells, 20-28^; length 4-12/i, 



Oedogonium dioicum, macrandrium; oogoniis singulis, globoso-ellip- 

 soideis vel globosis vel depresso-globosis, poro superiore apertis; oosporis 

 globoso-ellipsoideis vel globosis vel depresso-globosis, oogonia complentibus 

 vel fere complentibus, membrana triplici; episporio (in latere exteriore) 

 laevi, mesosporio scrobiculato, endosporio laevi; plantis masculis paullo 

 gracilioribus quam femineis; antheridiis 1-5-cellularibus, saepe cum cellulis 

 vegetativis alternis; spermatozoidis binis, divisione horizontali ortis; cellula 

 fili basali forma, ut vulgo, elongata, cellula terminali apice obtusa; crassit, 

 cell, veget. plant, fem. 28-48^, altit. 40-100/^; crassit, cell, veget. plant, 

 masc. 24-30ju, altit. 40-100^; crassit oogon. 40-76m, altit. 40-70/^; crassit 

 oospor. 38-74m, altit. 46-56ai; crassit cell, antherid, 20-28;u, altit. 4-12)u. 



New Buffalo, May 31, 1915. Originally found in pool 

 on Newmans farm, northeast of Charleston, Illinois, 

 May 21, 1914. 



Oedogonium undulatum (Breb.) A. Br. White Fish Point, 

 Chippewa Co., July, 1913. (Hankinson). 



Oedogonium undulatum var. americanum nov. var. A new 

 variety with vegetative cells as in the type, but with 

 oogonia much larger, diameter 58-68^; length 60-80^; 

 oospore 48-60^ x 48-56/1. 



Var. cellulis vegetativis ut in typo; oogoniis comparate ad cellulas 

 vegetativas magis tumidis, crassit, 58-68)U, altit. 60-80p; oosporis oogonia 

 complentibus vel fere complentibus, crassit. 48-60/:, altit. 48-o6/i. 



Trout Lake, Aug. 10, 1915. 



Bulbochaete crassiuscula Nordst. Mackinaw City, Aug. 9, 

 1915. 



Bulbochaete crenulata Pringsheim. New Buffalo, May 31, 

 1915. 



Bulbochaete insignis Pringsheim. New Buffalo, May 31, 1915. 



Bulbochaete rectangularis Wittrock. New Buffalo, May 31, 

 1915. 



Bulbochaete varians Wittrock. New Buffalo, May 31, 1915. 



