FORM AND STRUCTURE OF BACTERIA 



39 



the gelatinous secretion, some organic material derived from 

 the media. The size of the pellicle varies with the size of the 



E F 



FIG. 28. Types of bacterial colonies. 04) Cochleate (B. coli, abnormal form). 

 (B) Conglomerate (B. zopfi). (C) Ameboid (B. vulgatus). (>) Rhizoid (B. my- 

 coides). () Curled (Bact. anthracis). (F) Myceloid (B.radiatus). (G) Fila- 

 mentous. After Frost. 



vessel containing the nutrient fluid. Care should be taken 

 not to confuse these masses of bacteria, i.e. zoogloea, pseudo- 

 zoogloea, and pellicles with the regular colonies of bacteria 



FIG. 29. Microscopic structure of colonies. (A) Colony as a whole, (i) Areo- 

 late. (2) Grumose. (3) Moruloid. (4) Clouded. (5) Gyrose. (6) Marmo- 

 rated. (7) Reticulate. (B) Edge of colonies. (8) Repand. (9) Lobate. 

 (10) Erose. (n) Auriculate. (12) Lacerate. (13) Fimbricate. (14) Ciliate. 

 After Frost. 



