534 Wisconsin Academy of Sciences , Arts , and Letters. 
II. Systematic account of the algae found in Wis¬ 
consin lakes. 
The present list comprises the Chlorophyceae, Myxo- 
phyceae and Heterokonteae of the collections. The Bacillar- 
iales and Desmidiaceae will be enumerated in a later paper. 
Several new species have been discovered during the course 
of the investigation but it has been thought advisable to 
exclude them for the present. 
Class MYXOPHYCEAE 
Order CHROOCOCCALES 
Family CHROOCOCCACEAE 
Genus CHROOCOCCUS Nageli 1849. 
Chroococcus turgid us (KUTZING) NAGELI, Gatt. 
einz. Algen, (1849) p. 46. G. S. West, Brit. Freshw. Algae, 
(1904) p. 352, fig. 166A. Protococcus turgidus Kiitzing, 
Tabulae Phycol. (1849) t. 6. fig. 1. 
Plankton; Beasley and Oconomowoc Lakes. Along shore; 
Otter, Old Taylor’s and Waubesa Lakes. 
Chroococcus minutus (KUTZING) NAGELI, Gatt. 
cinz. Algen, (1849) p. 46. Protococcus minutus Kiitzing, Phyc. 
gener. (1843) p. 168. Kiitzing, Tabulae Phycol. (1849) t. 5. 
Along shore; Rose Lake. 
var. minimus V. KEISSLER, in Verh. d. k.-k. zpok- 
bot. Ges. in Wien, 51 (1901) p. 394, figs. 1-2. 
Along shore; Adelaide and Sunday Lakes. 
Chroococcus limneticus LEMMERMANN, in Bot. 
Gent. 76 (1898) p. 153. Lemmermann, in Forschungsbr. 
a. d. Biol. Stat. zu Plon, 7 (1899), p. 132, t. 1, figs. 22-23. 
Plankton; Beasley, Kawaguesaga, Oconomowoc, Old Tay¬ 
lor’s, Squirrel and Winnebago Lakes. 
var. carneus (GHODAT) LEMMERMANN, in Arkiv. 
for Botanik, 2 (1903) No. 2, p. 101. Chroococcus minutus var. 
carneus Chodat, in Bull. Herb. Boiss. 6 (1898) p. 180. 
Plankton; Big Bass, Harris, Mendota and Oconomowoc 
Lakes. 
var. subsalus LEMMERMANN, in Forschungsbr. a. d. 
Biol. Stat. zu Plon, 8 (1901) p. 84. Lemmermann, in Arkiv 
for Botanik, 2 (1903) No. 2, p. 101, t. 1, fig. 9. 
Plankton; Big Bass Lake. 
