Chroococcus limneticus var. subsalsus Lemmermann 1901c, p. 84 



PI. 100, Fig. 10 



A globose or ovoid to ellipsoid colony of 8-32 spherical cells, 

 evenly scattered within a wide, hyaline, and homogeneous colonial 

 envelope of mucilage; individual cell sheaths not evident; cell con- 

 tents bright blue-green and non-granular; cells smaller than in the 

 typical plant, 3-4.5^i in diameter without sheaths. 



Euplankter. Found in a number of lakes; rare but widely distrib- 

 uted in our region. Mich., Wis. 



Chroococcus minimus (Keissl. ) Lemmermann 1904, p. 102 



A globose or elliptical colony of 4-8 spherical or ovoid cells in a 

 wide, hyaline, non-lamellated colonial envelope; cells 2-3/x in diam- 

 eter without sheaths; contents blue-green, non-granular. 



Euplankter. Wis. 



Chroococcus minor ( Kuetz. ) Naegeli 1849, p. 47 

 PI. 100, Fig. 12 



A small gelatinous attached and amorphous mass in which cells 

 (spherical or angular from mutual compression) are irregularly 

 scattered, singly, in pairs, or in larger groups resulting from repeated 

 cell division; individual cell sheaths scarcely visible, confluent with 

 the colonial envelope; cell contents pale to bright blue-green, non- 

 granular; cells 3-4)u. in diameter without sheath. 



Growing on moist substrates or intermingled with dense clots of 

 miscellaneous algae; often forming small masses on Potamogeton 

 spp. or other submerged aquatics; sometimes buried in the decaying 

 tissues of higher plants. Wis. 



Chroococcus minutus ( Kuetz. ) Naegeli 1849, p. 46 

 PI. 100, Fig. 9 



A small, amorphous, mucilaginous mass in which spherical or 

 hemispherical cells are compactly arranged within a wide hyaline 

 envelope; individual cell sheaths indistinct, not lamellated; cell 

 contents blue-green, either homogeneous or finely granular; cells 

 5-7- (10) /A in diameter without sheaths. 



Common in a great variety of both hard and soft water lakes; 

 tychoplankter; found among dense growths of algae and higher 

 aquatics in shallow water of lakes, cut-offs from lakes, and in 

 swamps; sometimes appearing incidentally in tow samples from 

 Sphagnum bogs. Mich., Wis. 



[449] 



