9. Cells elongate-cylindric, 13-15m in diameter, up to 3 times 



the diameter in length ^f . elepans 



9. Cells shorter, 15-20yu in diameter, % to twice 



the diameter in length _.. M. Loefgrenii 



Microspora amoena ( Kuetz. ) Rabenhorst 1868, p. 321 



PI. 8, Fig. 8 

 Wall thick, lamellate, the 2 sections very evident in the midregion. 

 Cells cvhndrical, slightly constricted at the cross walls; (21.5)-25-27^ 

 in diameter, 36-38/i, long. Chloroplast sometimes completely cover- 

 ing the cell wall; in our specimens frequently perforate. 



Intermingled with other algae in shallow water of bays and in 

 swamps; quiet water. Mich., Wis. 



Microspora crassior ( Hansg. ) Hazen 1902, p. 169 



PI. 8, Fig.l 

 Cell walls thick, the sections evident at the juncture in the mid- 

 region of the cell. Cells cyhndrical or slightly swollen, very slightK^ 

 constricted at the cross walls; 26-28- (33)^ in diameter, 28-34'/^ 

 long. Chloroplast densely granular and covering the entire cell wall. 

 Very common in a number of soft water lakes, intermingled with 

 other filamentous algae; often forming pure growths. Mich., Wis. 



Microspora elegans Hansgirg 1891, p. 311 

 Walls thick, lamellate, the sections evident at the juncture in the 

 midregion of the cells. Cells cylindrical or slightly constricted at the 

 cross walls, 13-14-(15)/a in diameter, 15.6-20-(39)/x long. Chloro- 

 plast a parietal granular plate nearly covering the cell wall. 



The thick walls and the proportions of the cell dimensions seem 

 to warrant assigning our specimens to this species. They should be 

 compared with Microspora pachyderma, which is smaller. 

 In a roadside swamp. Wis. 



Microspora floccosa ( Vauch. ) Thuret 1850, p. 221 



PI. 8, Fig.4 

 Walls relatively thin, sections not always evident in the midregion 

 of the cell. Cells cylindrical or slightly swollen; 14-17/x in diameter, 

 22— 29— (35) /x long. Chloroplast usually reticulate. 

 In Sphagnum bogs and in swamps. Mich., Wis. 



Microspora Loefgrenii ( Nordst. ) Lagerheim 1887a, p. 417 



PL 8, Fig. 2 

 Walls thick, sections evident in the midregion of the cell. Cells 

 short-cylindric, rectangular, as long as broad or a little longer; 



[107] 



