GOLENKINIA Chodat 1894, p. 305 



Cells spherical, solitary and free-floating, the wall furnished with 

 long, slender tapering setae; false colonies sometimes formed by the 

 interlocking of setae; cells rarely inclosed by a thin, mucilaginous 

 envelope; chloroplast a parietal cup covering most of the cell wall, 

 containing 1 pyrenoid; reproduction by autospores and zoospores. 



This genus seems to belong with the Oocystaceae, and it should 

 be compared with spherical members of that family. The justification 

 for placing it with the Chlorococcaceae is the report that zoospores 

 are formed in asexual reproduction, a method not used by the 

 Oocystaceae. 



Key to the Species 



Cells 15-18^1 in diameter; setae 12-18|a long G. paucispina 



Cells 7-15/u in diameter; setae 25-45/i long G. radiatn 



Golenkinia paucispina West & West 1902, p. 68 

 PI. 45, Fig. 2 

 Spherical, free-floating unicells with a few short setae arising from 

 all sides of the cell wall; 1 cup-shaped chloroplast, with 1 pyrenoid; 

 cells 15— 18/i in diameter; setae about 16/x long. 

 Rare, in the plankton of several lakes. Wis. 



Golenkinia radiata ( Chod. ) Wille 1911, p. 57 



PI. 45, Fig. 3 



Spherical, free-floating unicells with long and very slender setae; 



cells usually solitary but often in false colonies of 4 as a result of the 



interlocking of the setae; cells 7-15/^ in diameter; setae 25-45/* long. 



Rare; in euplankton. Mich., Wis. 



FAMILY ENDOSPHAERACEAE 



In this family the plants are unicellular, large, irregularly oblong 

 or ovate in shape, free-living, parasitic, or (in our region) endo- 

 phytic, embedded in the tissues of higher plants or in the mucilage 

 of other algae. The chloroplasts are parietal in young cells but be- 

 come massive and axial in older plants, with several pyrenoids. The 

 wall is thick and lamellate, or has knob-like elongations. The family 

 is unique in that the single cells are diploid, being but enlargements 

 of the zygospore formed by the union of isogametes. Reduction 

 division occurs when the cell contents divide to form as many as 

 256 biflagellate protoplasts. It is possible that zoospores, as well as 

 gametes, are produced in this way. 



[ 213 ] 



