4 



MORPHOLOGY 



FIG. 30. (A) Types of streak cultures, (i) Filiform (B. coli). (2) Echinulate 

 (Bact. acidi-lactici). (3) Beaded (Str. pyogenes). (4) Effuse (B. vulgatus). 

 5. Arborescent (B. Mycoides). 



(B) Types of growth in stab cultures. Nonliquefying : (i) Filiform (B. coli). 

 (2) Beaded (Str. pyogenes). (3) Echinate (Bact. acidi-lactici). (4) Villous 

 (Bact. murisepticum). (5) Arborescent (B.mycoides). Liquefying: (6) Crateri- 

 form (B. vulgaris, 24 hr.). (7) Napiform (B. subtilis, 48 hr.). (8) Infundi- 

 buliform (B. prodigiosus) . (9) Saccate (Msp. finkleri). (10) Stratiform (Ps. 

 fluorescens). After Frost. 



