C . xerosis
Gram-positive Absent
medium sued
barred, regularly tapered
rods,
palisades
Atypical
Gram-positive, Present
Corynebacterium long branched,
SP.
curved, clubshaped rods,
Chinese
letters
Shiny black
Smooth, Small,
colonies
shiny
smooth
without halo
black,
white,
small
circular
colonies colonies
Large
Verydry, DTy,
black rough
rough,
silverish
colonies
irregular surface,
without halo
crenated irregular
margins, edges,
dark black very
friable
Smooth,
creamy
culture
Rough,
white or
yellow
culture,
slow
growth
S 1 i g h t 1 y
uniform,
turbid
culture
Clear
with
veil on
surface
+ + + + - +
or
-
+
t + - + + - or
+
$ + + - - -
or
+
s - - + * - or
-
-
-
Corynebacterium Gram-positive Present
Circular,
Minute,
Minute,
Granular Clear
variant with
at ends,
greyish,
black
silverish white,
with
dwarf
minute short,
minute
colonies, colonies, slow
deposit
colonies
slender rods,
colonies
growing regular
growth
+ - - + * -
rare
growing
slowly
or crenated
slowcorpuscles
slowly,
edges
IY
slight halo
+ , positive reactions.
- , negative reactions.
t, 3, 9, three different fermentative types of atypical corynebacteria.