FAMILY III. CRENOTRICHACEAE 



275 



or by rather uniform, spherical, non-motile 

 conidia formed into short trichomes in 

 chains of 2 to 6 or more, their diameters 

 being about 2 microns. 



Historical: This organism was described 

 by Roze as a blue-green alga, but subse- 

 quent observers have failed to find pigment. 

 It was described independently by Schorler 

 (Cent. f. Bakt., II Abt., 12, 1904, 689) who 

 also gave it the name Clonothrix fusca. 

 Cholodny considered it identical with 



Crenolhrix polyspora, but Kolk (Amer. 

 Jour. Bot., 25, 1938, 11) has clearly differ- 

 entiated these species. 



Source : From a well in Proskau, Schlesien. 



Habitat: Widely distributed in rivers 

 and streams with gravelly, manganese- 

 bearing bottoms; also found in water works 

 and pipe lines, where it may cause technical 

 difficulties. May occur in dark brown masses 

 that are large enough to be seen readily in 

 tap water. 



