
what are the morphologies of a bacterial colony?
what are the morphologies of a bacterial colony?
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Form (shape of colony)
circular (round)
irregular
filamentous (branched network)
rhizoid (root‑like extensions)
punctiform (tiny dot‑like)
Margin (edge outline)
entire (smooth)
undulate (wavy)
lobate (lobed)
filamentous
curled (concentric rings or rippled)
Elevation (profile in vertical axis)
flat
raised
convex (dome‑shaped)
pulvinate (very convex, cushion‑like)
umbonate (raised centre knob)
crateriform (central depression)
Size
punctiform (< 1 mm), small, moderate, large
Color & pigmentation
white, cream, yellow etc.
presence of diffusible pigments (eg Serratia’s red, Pseudomonas green/blue)
Opacity
transparent, translucent, opaque, iridescent
Surface texture
smooth, glistening
rough, dull, wrinkled, veined
Consistency (feel)
creamy, mucoid (slimy), dry, sticky, brittle
Additional traits
hemolysis (alpha, beta, gamma on blood agar)
odor (grape‑like, ‘old socks’, chocolate cake)

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