CLADOTHRIX DICHOTOMA. 



491 



cylindrical plates. Its mode of development is as yet other- 

 wise unknown. 



Phragmidiothrix multiseptata. 



Found by Engler in the salt water of the bay at Kiel. The 

 threads are 3 to 6 p. in thickness, and are subdivided by 

 transverse divisions into very short cylinders ; in these 

 cylinders longitudinal division then occurs in two or more 

 directions. From the minute coccus-like portions threads? 

 at first very thin but constantly becoming broader, are 

 formed. 





Cladothrix dichotoma. 



Very common in impure waters, in the waste waters ciadothm 

 from manufacturing places, &c. It may be artificially Occurrenc 

 cultivated in decoctions of decomposing algae, mud, 



Fig. 137. Cladothrix dichotoma. (After Cohn.) 

 Apparent dichotomous threads X 100. At a these are 

 more highly magnified (X 600), and the false dicho- 

 tomotis divisions are distinctly seen. 



flesh, &c. It forms floating flakes and deposits on solid 

 substrata 1 to 2 mm. in height. The threads were 

 ormerly described as a species of leptothrix ; they form 

 pseudo-branches, some of tbe rods bending to one side 

 and elongating to form threads by continued sub- 

 division. This system of branches often attains great 1 F 1 alse bran( 



