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.
