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



Desmidium swartzii Ag. Railroad pool, Seney, Aug. 12, 1915; 



Manistique, Aug. 11, 1915; Twin Lake, June 2, 1915; 



bog north of Blaney, Aug. 12, 1915. 

 Desmidium cylindricum Grev. Twin Lake, June 2, 1915. 

 Gymnozyga moniliformis Ehrenb. Bog east of Caffey, Aug. 13, 



1915; Twin Lake, June 2, 1915. 



ZYGNEMACE.t. 



Spirogyra afRnis (Hass.) Kiitz. Small stream, Saugetuck, 

 June 1, 1915. Very typical material. Previously reported 

 from Jamaica and Alaska. 



Spirogyra varians (Hass.) Kiitz. Slow stream near Douglas 

 Lake, July 21, 1914; railroad pool, New Buffalo, May 31, 

 1915; estuary, Holland, June 3, 1915; bog north of Blaney, 

 Aug. 12, 1915. 



Spirogyra dubia Kiitz. Bog stream, Saugetuck, June 1, 1915; 

 stagnant pool, Orchard Lake, Aug. 16, 1915. 



Spirogyra jugalis (Dillw.) Kiitz. Trout Lake, Aug. 10, 1915. 



Spirogyra nitida (Dillw.) Link. New Baltimore, Aug. 8, 1915. 



Spirogyra ellipsospora Transeau. New Baltimore, Aug. 8, 

 1906 (Hankinson) ; Saugetuck, June 1, 1915. 



Spirogyra fluviatilis Hilse. New Baltimore, Aug. 8, 1906 

 (Hankinson) ; White Fish Point, Aug. 17, 1914 (Hankinson). 

 Vegetative material, probably of this species, was found 

 in all parts of the state. 



Spirogyra reflexa Transeau. Railroad pools. New Buffalo, 

 May 31, 1915. Previously recorded only from prairie 

 ponds in south central Illinois. This material is of par- 

 ticular interest as it contains aplanospores as well as 

 zygospores. 



Spirogyra protecta Wood. Stream pool, Breedsville, Van 

 Buren Co., June 4, 1915. This material contained a few 

 aplanospores, together with the zygospores. 



Spirogyra tenuissima (Hass.) Kiitz. Railroad ditch. New 

 Buffalo, May 31, 1915. 



Spirogyra majuscula Kiitz. Lake, Bangor, June 4, 1915. 



Spirogyra maxima (Hass.) Wittr. Van Etten Creek, Oscoda, 

 Iosco Co., Aug. 12, 1916, (Hankinson). 



Mougeotia calcarea (Cleve) Wittr. Carp Lake, Emmet Co., 

 Aug. 9, 1915. This material contains zygospores abund- 

 antly. The diameter of the vegetative cells varies from 

 8 to 10 microns. Previously recorded from Illinois, but 

 there found only with aplanospores. 



