Smith—Algae Found in Wisconsin Lakes. 555 
Algen, in Cohn, Kryptogamen-Flora von Schlesien, 2 (Erste 
Halfte) (1878) p. 98. 
Along shore; Muskallonge and Sunday Lakes, 
var. brevicauda SMITH, Trans. Wis. Acad. ined. 
Plankton; Lake Mendota. Along shore; Monona and Wau- 
besa Lakes. 
Genus TETRADESMUS Smith 1913. 
Tetradesmus wisconsinensis SMITH, in Bull. Torr. 
Bot. Club, 40 (1913) p. 76, t. 1, figs. 1-20. 
Along shore; Kegonsa, Muskallonge, Star and Waubesa 
Lakes. 
Genus TETRASTRUM Chodat 1895. 
Tetrastrum Staurogeniaeforme (SCHRODER) CHO¬ 
DAT, in Mater, pour la flore cryptogamique Suisse, i, Fasc. 
3 (1902) p. 208, p. 223, fig. 148 12 . Cohniella staurogeriiae- 
formis Schroder, in Ber. d. D. bot. Ges. 15 (1897) p. 373, 
t. 17, fig. 5. 
Plankton; Lake Mendota. 
Genus CRUCIGENIA Morren 1830. 
Crucigenia quadrata MORREN, in Ann. Sci. Nat. 20 
(1830) p. 415, t. 15, figs. 1-5. 
Plankton; Pardee Lake. 
Crucigenia rectangularis (N AG ELI) GAY, Re- 
cherches sur le dev. et la class, de quelques algues vertes, 
(1891) p. 100, t. 15, fig. 151. Chloropedium rectangularis 
Nageli, in A. Braun, Alg. unicell. (1855) p. 70. 
Plankton; Fowler, Kegonsa, Okauchee, Old Taylor’s and 
Winnebago Lakes. 
Crucigenia Lauterbornei (SCHMIDLE) CHODAT, in 
Mater, pour la flore cryptogamique Suisse, 1 , Fasc. 3 (1902) 
p. 206, fig. 127. Staurogenia Lauterbornei Schmidle, in Allg. 
Bot. Zeitschr. 2 (1896) p. 192, fig. 1. 
Plankton; Lake Kegonsa. 
