176 



LABORATORY EXERCISES IN BACTERIOLOGY. 



(A) Form : 



Punctiform, dimensions too slight for defining form by naked eye; minute, 



raised, semi-spherical. 

 Round, of a more or less circular outline. 

 Irregular. 

 Elliptical. 



Fusiform, spindle-shaped, tapering at each end. 

 Cochleate, spiral or twisted like a snail-shell (Fig. 53, A). 

 Ameboid, very irregular, streaming (Fig. 53, B). 



FIG. 51. GROSS CULTURAL APPEARANCES, NON-LIQUEFYING. (After Chester. 



A. Types of elevation of cultures. /. Flat. 2. Raised, j. Convex. 4. Pulvinate. 5. 

 Capitate. 6. Umbilicate. 7. Umbonate. 



B. Types of growth along puncture. /. Filiform. 2. Beaded, j. Echinate. 4. Arbores- 

 cent j". Villous. 



Mycelioid, a filamentous colony, with the radiate character of a mould (Fig. 



54, D). 



Filamentous, an irregular mass of loosely woven filaments (Fig. 54, E). 



Floccose, of a dense wooly structure. 



Rhizoid, of an irregular branched, root-like character, as in Bact. mycoides 



(Fig. 53, C). 



Conglomerate, an aggregate of colonies of similar size and form (Fig. 55, A). 

 Toruloid, an aggregate of colonies, like the budding of the yeast plant (Fig. 



55, B). 



Rosufate, shaped like a rosette. 



