Chlamydomonas pseudopertyi Pascher 1927, p. 214 



PL 1, Fig. 12 

 Cells globose, with a prominent, hemispherical papilla. Chloro- 

 plast cup-shaped, dense in the basal portion; 2 anterior contractile 

 vacuoles; pyrenoid posterior; pigment-spot lens-shaped, anterior and 

 lateral. Cells 12-18-(27)/. in diameter. 

 Tychoplankter; rare. Wis. 



Chlamydomonas Snowii Printz 1914, p. 18 



PI. 1, Figs. 13, 14 



Cells narrowly ovoid to ellipsoid, with an anterior beak. Chloro- 



plast a parietal cup, dense in the posterior portion; 1 pyrenoid, 



centrally located, palmella stages frequent. Cells 6.5-8/a in diameter, 



10-15/i, long. 



Tychoplankter; rare. Mich., Wis. 



Chlamydom^onas sphagnicola Fritsch & Takeda 1916, p. 373 



PI. 1, Figs. 15, 16 

 Cells broadly ovoid to subglobose, broadly rounded both anteriorly 

 and posteriorly, with 2 prominent papillae at the anterior end; the 

 protoplast separated from the wall, also having pointed apical papil- 

 lae. Chloroplast a parietal sheet, granular, covering most of the cell 

 membrane (in our specimens more dense toward the basal part); 

 pyrenoids several (4-6), scattered; pigment-spot prominent, anter- 

 ior, nearly median. Cells 15-18/a in diameter, 21-29/i, long. 



This species commonly forms resting stages during which 2-4 cells 

 are formed within the old mother cell. 



Common in Sphagnum bogs; tychoplanktonic in lakes. Wis. 



CARTERIA Diesing 1866, p. 356 



Cells oval or round in cross section, elliptic, oval, or cordiform in 

 front view, with a definite cell wall; furnished with 4 long flagella. 

 Chloroplast parietal, cup-shaped, with or without a pyrenoid; 

 pigment-spot usually present, at the anterior end of cell. 



Species in this genus should be compared carefully with Chlamy- 

 domonas spp. Carteria in the past has been placed in a separate fam- 

 ily (Carteriaceae), mostly on the basis of the number of flagella. 

 Only 2 species have appeared in our collections. 



Key to the Species 



Cells cordiform, broadest at the anterior end, 



which is concave - C. cordiformis 



Cells ellipsoid or ellipsoid-cylindric, narrower, and 



papillate at the anterior end - C. Klebsii 



[72] 



