Smith—Algae Found in Wisconsin Lakes. 
551 
Chodatella subsalsa LEMMERMANN, in Hedwigia, 37 
(1898) p. 310. Lagerhemia subsalsa Lemmermann, in Fors- 
chungsbr. a. d. Biol. Slat, zu Plon. 6 (1898) p. 193, t. 5, 
figs. 2-6. 
Plankton; Muskallonge Lake. 
Sub-family TETRAEDRIEAE 
Genus TETRAEDRON Kiitzing 1845. 
Tetraedron minimum (A. BRAUN) HANSGIRG, in 
Hedwigia, 27 (1888) p. 131. G. S. West, Brit. Freshw. Algae, 
(1904) p. 231, fig. 101A. Polyedrium minimum A. Braun, 
Algarum unicell. (1855) p. 94. 
Plankton; Mendota and Okauchee Lakes. Along shore; 
Clear, Muskallonge, Nemahbin (Lower), Old Taylor’s, 
Rozen and Waubesa Lakes. 
Tetraedron enorme (RALFS) HANSGIRG, in Hed¬ 
wigia, 27 (1888) p. 132. Staurastrum enorme Ralfs, Brit. 
Desmidieae (1848) p. 140, t. 33, figs, lla-lle. 
Along shore.; Lakes Kegonsa, Mendota and Waubesa. 
Tetraedron trigonum (NAGELI) HANSGIRG, in 
Hedwigia, 27 (1888) p. 130. Polyedrium trigonum Nageli, 
Gatt. einz. Algen, (1849) p. 84, t. 4, fig. Bl. , 
Along shore; Lake Mendota. 
Tetraedron caudatum (CORDA) HANSGIRG, in 
Hedwigia, 27 (1888) p. 131. G. S. West, Brit. Freshw. Algae, 
(1904) p. 231, fig. 101B. Astericium caudatum Gorda, in 
Almanach de Carlsbad, 9 (1839) p. 238, t. 1, figs. 1-2. 
Plankton; Lake Mendota. Along shore; Muskallonge, 
Razorback and Waubesa Lakes. 
Tetraedron limneticum BORGE, in Bot. Notiser, 
(1900) p. 5, t. 1, fig. 2. 
Plankton; Clear, Mud (Vilas Co.) and Squirrel Lakes. 
Tetraedron pusillum (WALLICH) W. & G. S. WEST 
in Jour, of Bot. 35 (1897) p. 237. Micrasterias pusilla Wal- 
lich, in Ann. and Mag. of Nat. Hist. 3 Ser. 5 (1860) p. 281, 
t. 13, fig. 13. 
Along shore; Clear and Mendota Lakes. 
