CULTURAL CHARACTERS OF BACTERIA 23 



C. Internal structure of colony (microscopic). 



1. Refraction weak, outline and surface of relief not strongly defined. 



2. Refraction strong, outline and surface of relief strongly defined ; 



dense, not filamentous colonies. 

 General. 

 Amorphous, without definite structure as below specified. 

 Hyaline, clear and colorless. 



Homogeneous, structure uniform throughout all parts of the colony. 

 Homochromous, colony uniform throughout. 

 Granulations or Blotchings. 

 Finely granular. 

 Coarsely granular. 

 Grumose, coarser than the preceding, a clotted appearance, particles 



in clustered grains. Fig. 12, D. 

 Moruloid, having the character of a morula, segmented, by which 



the colony is divided in more or less regular segments. Fig. 12, 



E. 

 Clouded, having a pale ground, with ill-defined patches of a deeper 



tint. Fig. 12, F. 

 Colony Marking or Striping. 

 Reticulate, in the form of a network, like the veins of a leaf. Fig. 



12, G. 

 Areolate, divided into rather irregular, or angular, spaces by more 



or less definite boundaries. 

 Gyrose, marked by wavy lines, indefinitely placed. Fig. 12, I. 

 Marmorated, showing faint, irregular stripes, or traversed by vein- 

 like markings, as in marble. Fig. 12, H. 

 Rivulose, marked by lines, like the rivers of a map. 

 Rimmose, showing chinks, cracks, or clefts. 

 Filamentous Colonies. 



Filamentous, as already defined. Fig. n, E. 



Floccose, composed of filaments, densely placed. 



Curled, filaments in parallel strands, like locks or ringlets, as in 



agar colonies of B. anthracis. Fig. 10, F. 



D. Edges of colonies. 



Entire, without toothing or division. Fig. 13, a. 

 Undulate, wavy. Fig. 13, b. 



Repand, like the border of an open umbrella. Fig. 13, c. 

 Erose, as if gnawed, irregularly toothed. Fig. 13, i. 

 Lobate. Fig. 13, d. 



