THE RELATIONSHIP OF BACTERIA 123 



carried in special hollow chromatophores. This chlorophyll 

 does not seem to be as complex as that of higher plants. 

 Certain bacteria, for example, Bacterium viride Van 

 Teigman, contain a slight amount of green coloring matter 

 similar to the chlorophyll of the blue-green algae. They 

 are on the whole more highly differentiated than the 

 bacteria. Besides reproducing by fission the Cyanophyceae 

 at certain periods may reproduce by forming gonidia similar 

 to the higher bacteria. 



It should be remembered that there is no genetic relation- 

 ship between the bacteria and the Cyanophyceae. They are, 

 however, related through a common ancestor. 



Relationship to Euphyceae. The Euphyceae, or true algae, 

 vary in size and structure from simple microscopic, unicel- 

 lular forms to highly developed and complex bodies. The 

 Euphyceae are not related except by a common stock to the 

 Cyanophyceae, or blue-green algae. Certain of the unicel- 

 lular forms resemble the bacteria in their morphology, but 

 differ from them in that they reproduce by zoospore forma- 

 tion, in the possession of chlorophyll and chromogenic plastids, 

 and also in the character of the cell wall. The similarity of 

 the bacteria and the Euphyceae is only superficial. The 

 two groups cannot be shown to be related directly. 



Relationship to Myxomycetes or Slime Molds. These 

 low forms of life are most frequently found upon decaying logs, 

 leaves, etc. At certain periods they suggest a relationship 

 with some of the single-celled animals and the fungi. Some 



