Large (3 mm)
translucent with a fibrillar edge
circular colonies with a rough edge
fluoresce green-yellow under UV light
characteristic farmyard smell.
become flattened and irregular in old cultures.
Colonies tend to fuse
form spreading growth with a double zone of β- haemolysis.
produces lecithinase and lipase
regular convex colonies
may be rough and flat with an irregular edge
has a double zone of β-haemolysis
thick swarming growth
narrow zone of β-haemolysis
circular colonies with crenated edges
which may spread
may be β-haemolytic
Fine swarming growth (difficult to see)
may appear β-haemolytic
Other clostridium species
Colonial appearances vary
produce a spreading growth
may or may not be β-haemolytic
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