15-20/i in diameter, 18-20/i, long. Chloroplast a loose net, covering 

 nearly all of the cell wall. 



Entangled about the stems of Chamaedaphne in Sphagnum bogs. 

 Mich., Wis. 



Microspora pachyderma ( Wille) Lagerheim 1887a, p. 415 



PI. 8, Fig. 3 



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

 cylindrical; (8)-9-ll-(12)/t in diameter, 14.8-16;a long. Chloro- 

 plast a folded plate, covering most of the cell wall. 



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



Microspora quadrata Hazen 1902, p. 178 



Walls thin, sections not evident. Cells short-cylindric, rectangular, 

 about equal in length and diameter; 5.5-7 /* in diameter, 5.5-7.5/i. 

 long. Chloroplast finely granular, covering the entire cell wall. 



Found in a swamp near Sand Lake, Vilas County, Wisconsin; also 

 in Michigan. 



Microspora stagnorum (Kuetz. ) Lagerheim 1887a, p. 417 



PL 8, Figs. 6, 7 

 Walls thin, the two sections not evident. Cells cylindrical, or 

 slightly constricted at the cross walls, as much as 3 times their diam- 

 eter in length; d/x wide, 10-25- ( 27 )/i, long. Chloroplast a granular 

 sheet, incompletely covering the wall. 



Common in the shallow water of many lakes, intermingled with 

 other filamentous algae; also collected from a depth of 15 meters 

 (in Crystal Lake, Vilas County, Wisconsin). Mich., Wis. 



Microspora tumidula Hazen 1902, p. 177 

 PI. 8, Fig. 9 

 Walls thin to relatively thick, lamellate, the sections of the wall 

 very evident in the midregion of the cell. Cells cylindrical, slight- 

 ly constricted at the cross walls; 7.4/i, in diameter, 10—14.8//. long. 

 Chloroplast densely granular. 



Common in the shallow water of many lakes; in Sphagnum bogs 

 and in swamps. Mich., Wis. 



Microspora Willeana Lagerheim in De Toni 1889, p. 228 



PI. 8, Fig. 5 

 Walls thin, sections scarcely discernible. Cells cylindrical, slightly 

 or not at all constricted at the cross walls; ll-14/i in diameter, 



[108] 



