Myxophyceae 39 



Proc. Biol. Soc. Wash. 21: 96. 1908. Buchanan. Notes on the Algae 

 of Iowa. Proc. Iowa Acad. Sci. 14: 9. 1908. 



Plate II. fig. 23-28. 



Colonies 50-90 mic. in diameter, spherical or nearly spherical, blue- 

 green often becoming pale; tegument colorless, rather thick, lamellose; 

 individual sheaths colorless; cells 4-5 mic. in diameter, 8-12 mic. in length, 

 pear-shaped or club-shaped, stalked, surrounded by individual sheaths; 

 stalks thick, broad, gelatinous; cell contents not showing vacuoles, blue- 

 green, sometimes green or orange. 



United States. Frequent in small pools. (Wolle). Rhode Island. 

 Providence. (Bennett). New Jersey. In ponds and pools. (Wolle). 

 Ohio. Plankton. Put-in-Bay, Lake Erie. (Snow). Brush Lake, Champaign 

 County. (Riddle). Minnesota. Pool near Lake Kilpatrick. July 1S93. (Bal- 

 lard). In tank in Botanical laboratory. University of Minnesota, Minne- 

 apolis. October 1895; in covered tank. Zoological laboratory. University 

 of Minnesota, Minneapolis. April 1898. (Tilden). Iowa. Found only 



once. Stagnant pool. Eagle Grove. 1904. (Buchanan). Nebraska. In 



aquaria. Lincoln. (Bessey). Washington. Floating intermingled with 



other algae in brackish waters. Whidbey Island. (Gardner). California. 

 Near Los Angeles. (Monk). Central America. Lake Amatitlan, Guate- 

 mala. (Meek). Hawaii. Among marine algae. Island of Laysan. 

 (Schauinsland). 



Var. cordiformis Wolle. Fresh-Water Algae. VI. Bull. Torr. Bot. Club 

 9: 25. 1882. Bot. Notiser. 61. 1882. De Toni. Syll. Algar. 98. 1907. 



Colonies 60 mic. in diameter; cells 6-13 mic. in diameter, 9-16 mic. in 

 length, usually numerous. 



Pennsylvania. Small ponds near Bethlehem. (Wolle). 



92. Gomphosphaeria rosea (Snow) Lemmermann. Algae. Krypt. der 



Mark Brandenburg. 3: 80. 1907. 



Snow. Tlie Plankton Algae of Lake Erie. U. S. Fish Comm. Bull, for 

 1902. 22: 387, 390, 392. pi. 4. f. 17. 1903. (Coelosphaerium roseu m). 



Colonies 35-52 mic. in diameter, spherical; tegument thin, gelatinous; 

 cells 3.2-4 mic. in diameter, spherical, without individual sheaths, stalked; 

 stalks, gelatinous, dichotomously branched; cell contents pinkish or brown- 

 ish. 



Ohio. Plankton. Put-in-Bay, Lake Erie. (Snow). 



Genus Coelosphaerium Naeg. Gatt. Einz. Alg. 54. 1849. 



Colonies spherical, mucous, hollow, free-swimming, containing many 

 small cells; tegument mucous, soon confluent; cells globose, elliptical or 

 ovoid, arranged just within the periphery of the tegument; cell contents 

 granular, with gas vacuoles; reproduction by cell division, at first in one 

 direction, afterwards alternately in three directions. 



I Colonies 30-90 mic. in diameter; cells 2-5 mic. in diameter 



C. kuetzingianum 



II Colonies about 150 mic. in diameter; cells 5-7 mic. in diameter 



C. dubium 



