RHODO-THIOBA CTERIA 



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form of vegetative development that has come into being as 

 a result of new and unaccustomed conditions of growth, and 

 that the fusion is due to contact irritability. The new condi- 

 tions of growth are certainly responsible for the marked change 

 observed in the size of the cells. The buds are more likely to 

 be comparable to the " clamp connections " that are found 

 in some of the Fungi, and are, therefore, more of the nature of 

 simple vegetative fusions or mixing of plasma from different 



Fig. 29. — Chromatium Warmingii forma minus (after Bavendamm), show- 

 ing the development of buds in artificial cultures of this organism. 

 The buds of different individuals are observed to be united. For 

 purposes of comparison of size a cell of the normal Chy. Okenii is 

 shown at circa X 2000. 



sources. The unions observed in Bavendamm's cultures 

 appear to be similar to the H-connection in the Fungi and some 

 of the Floridese, which are not sexual. 



Chromatium Linsbaueri (Gicklhorn). 



Literature. — Gicklhorn (i), 1921 ; Bavendamm, 1924 ; 



Scourfield, 1925 ; ElHs (11), 1929. 

 Description. — This species is distinguished from Chr. Okenii 

 by its Hme content, and more particularly by its peculiar 



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