40 Minnesota Algae 



93. Coelosphaerium kuetzingianum Naegeli. Gatt. Einz. Alg. 54- pl- !■ C. 



1849. De Toni. Syll. Algar. 5: 100. 1907. 



Farlow. Notes on Fresh- Water Algae. Bot. Gaz. 8: 224. 1883. Camp- 

 bell. Plants of the Detroit River. Bull. Torr. Bot. Club. 13: 93. 1886. 

 WoUe. Fresh-Water Algae U. S. 327. pi. 210. f. 16. 1887. Arthur. Some 

 Algae of Minnesota supposed to be Poisonous. Fourth Bien. Rep. Bd. 

 Regents Univ. of Minn. Suppl. i. Rep. Dept. Agric. Univ. of Minn. 103. 

 1S87. Wittrock and Nordstedt. Algae Aq. Dulc. Exsicc. no. 692. 1884. 



Bennett. Plants of Rhode Island. 115. 1888. Collins. Algae of Middlesex 

 County. 16. 1888. Wolle and Martindale. Algae. Britton's Catalogue of 

 Plants found in New Jersey. Geol. Survey. N. J. 2: 611. 1889. Trelease. 

 The "Working" of the Madison Lakes. Trans. Wis. .Acad. Sci. Arts and Let- 

 ters. 7: 122. 1889. Collins. Algae. Flora of the Blue Hills, Middlesex 

 Fells, Stony Brook and Beaver Brook Reservations of the Metropolitan 

 Park Commission, Massachusetts. 126. 1896. Collins, Holden and Setch- 

 ell. Phyc. Bor.-Am. Ease. 12. no. 53. 1899. Fanning. Observations on 

 the Algae of the St. Paul city water. Minn. Bot. Studies. 2: 612. pi. 45. fig. 

 24. 1901. Riddle. Algae from Sandusky Bay. Ohio Nat. 3: 317. 1902. 



Nelson. Observations upon some Algae which cause "Water Bloom." 

 Minn. Bot. Studies. 3: 56. pi. 14. 1903. Snow. The Plankton Algae of 

 Lake Erie. U. S. Fish Comm. Bull, for 1902. 22: 392. 1903. Collins. 

 Phycological Notes of the late Isaac Holden, — II. Rhodora. 7: 235. 1905. 

 Buchanan. Notes on the Algae of Iowa. Proc. Iowa Acad. Sci. 14: 9. 1908. 



Plate II. fig. 29. 



Colonies 30-90 mic. in diameter, spherical; tegument colorless, thin, 

 gelatinous, soon diffluent; cells 2-5 mic. in diameter, subspherical, oval 

 or elongated, in twos or fours or finally irreguarly arranged; cell con- 

 tents finely granular, blue-green. 



United States. In ponds and pools; stagnant waters. (Wolle). 

 Massachusetts. Framingham. 1883. (Farlow). Scattered or as a scum on 

 Spot Pond, Middlesex Fells; forming a dense scum on Winchester Reser- 

 voir, Winchester. October 1898. (Collins). Connecticut On moist rocks. 

 Sage's Ravine, below first falls. Twin Lakes, Salisbury. October. (Holden). 

 Rhode Island. Providence. (Lathrop). New Jersey. On stagnant pools. 

 (Wolle). Ohio. Sandusky Bay. (Riddle). Michigan. Grosse Isle, near 

 the mouth of the Detroit River. Summer of 1885. (Campbell). Minne- 

 sota. Lake Sakatah and Lake Tetonka, Waterville. (Porter). St. Paul city 

 water. (Fanning). Iowa. "A frequent alga in many permanent ponds, 

 often floating in considerable quantities in the lakes." South Gar Lake, 

 Dickinson County; Hewitt's Pond, Eagle Grove; margin of slough. Eagle 

 Grove. 1904. (Buchanan). 



94. Coelosphaerium dubium Grunow in Rabenhorst. FI. Eur. Algar. 2: 55. 



1865. De Toni. Syll. Algar. 5: 102. 1907. 



Wood. Contr. Hist. Fresh-Water Algae North America. 13. 1872. 



Colonies about 150 mic. in diameter, irregular or sometimes spherical, 

 mucous, free-swimming; tegument colorless, thick; cells 5-7 mic. in diame- 

 ter, spherical; cell contents with gas vacuoles, blue-green. 



