Smith—Algae Found in Wisconsin Lakes 
631 
var. elegans var. nov. 
Cells with 5~7 bristles. (Plate 12, fig. 4). 
This new variety is justifiable since the cells of all the col¬ 
onies in the plankton of this lake possessed 5-7 bristles, whereas 
cells ordinarily have but 2-4. 
III. Eice (rr). 
Micractinium quadrisetum (Lemm.) G. M. Smith 
Bull. Torr. Bot. Cl. 43: 479. pi. 25, /. 17. 1916. 
II. Camp (rr), Eagle (rrr). 
Micractinium radiatum (Chodat) Wille. 
In Engler u. Prantl. Nat. Pflanzenfam. (Nachtr): 57. 1909. 
GolenMnia radiata Chodat, Jour, de Bot. 8: 303. pi. 3, figs. 1-24 1894. 
II. Green (rrr). 
Micractinium paucispinum (W. & G-. S. West) Printz 
Kristiana Vidensk. Skr. I. Mat.-Nat. Kl. 1913: No. 6: 55. 1914. 
GolenMnia paucispina W. & G. S. West, Trans. E. Irish Ac. 32: sec. B^; 
68. pi. 1, /. 18. 1902. 
III. Prairie (rr). 
Genus TETRAEDRON Kiitzing 1845. 
Tetraedron muticum forma punctulatum (Reinsch) de Toni. 
Sylloge algarum 1: 600. 1889. 
Folyedrmm muticum var. punctidatum Eeinsch, Notarisia 3: 498. pi. 4, /. 
6. 1888. 
III. Beaverdam (rr). 
Tetraedron minimum (A. Br.) Hansgirg. 
Hedwigia 27: 131. 1888; G. S. West, Brit. Freshw. Algae 231. f. 101a. 1904. 
I. Beaver (rr). 
II. Camp (rr). Paddock (rrr). 
Tetraedron caudatum (Corda) Hansgirg. 
Hedwigia 27: 131. 1888; G. S. West, Brit. Freshw. Algae 231. f. 101b. 
1904. 
III. Eeserve (rrr). 
