Merismopedia elegans A. Braun in Kuetzing 1849, p. 472 



PI. 101, Fig. 1 

 Colony irregularly quadrangular, composed of as many as 4000 

 compactly arranged, ovate cells, with the rows of cells becoming 

 distorted in older and larger colonies; cells 5-7.5/x in diameter, 7-9/i. 

 long; contents bright blue-green. 



Among other algae in shallow water but commonly found in 

 euplankton of several soft water lakes; in Sphagnum bogs. Mich., 

 Wis. 



Merismopedia elegans var. m^jor G. M. Smith 1920, p. 32 



PI. 100, Fig. 18 

 A variety diflFering from the typical by the larger size of the cells, 

 10-11/x in diameter, 12-14-(17)/a long. 



This variety is interpreted by Geitler (1930-31, p. 265) as a 

 separate species. 



Euplanktonic and tychoplanktonic. Mich., Wis. 



Merismopedia glauca ( Ehrenb. ) Naegeli 1849, p. 55 

 PI. 101, Figs. 2-4 



Colony of 16-64 ovate or hemispherical cells, very regularly ar- 

 ranged to form quadrangular colonies; 3-5-(7)ju, in diameter; 30-cell- 

 ed colony 30/a wide; cell contents bright blue-green, homogeneous. 



Very common in many lakes, especially soft water; scattered among 

 other algae ( tychoplankton ) , rarely in euplankton. Mich., Wis. 



Merismopedia aeruginea de Breb. is here included with M. glauca. 

 The former name refers to a species which has compactly arranged 

 cells, violet-green in color, and with contents finely granular. Under 

 this name the plant was reported from Troutmere, Wisconsin, by 

 Macmillan. 



Merismopedia punctata Meyen 1839, p. 67 

 PI. 102, Fig. 10 



A rectangular plate of 32-128 ovate cells, usually loosely arranged, 

 sometimes in compact groups of 4-8 individuals, the groups widely 

 separated within a broad gelatinous envelope; cells 2.5-4/a in diam- 

 eter; cell contents homogeneous, blue-green. 



Scattered among other algae in several lakes. Mich., Wis. 



Merismopedia tenuissima Lemmermann 1898d, p. 154 



PI. 100, Fig. 17 

 ^ small rectangular plate of ( usually ) 16 minute ovate cells which 



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