Taxonomy
Morphology
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Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Nocardiaceae, Genus
Rhodococcus,
Rhodococcus fascians (Tilford 1936) Goodfellow 1984, comb. nov.

Historical synonyms:
Corynebacterium  fascians (Tilford 1936) Dowson 1942, "Phytomonas fascians" Tilford 1936, "Bacterium
fascians
" (Tilford 1936) Lacey 1939, "Pseudobacterium fasciens" (Tilford 1936) Krasil'nikov 1949, Rhodococcus luteus (ex Söhngen
1913) Nesterenko et al. 1982.
Gram-positive with strongly stained granules, slightly curved rods, 0.5-0.9 / 1.5-4.0 µm,
occurring singly, angularly and as palisades; bending and snapping division.
Non-motile.
Colonies are opaque, convex, moist, semi-fluidal and cream to yellow on nutrient
agar. Stable, rough, matt variants, not associated with loss of virulence, occur.
Thirteen carotenoid pigments have been identified. Slow growth - colonies on nutrient
dextrose agar have < 1 mm diameter after 3 days. Thiamine is an essential growth
factor. Grows at 37 ºC maximum, 24-27 ºC optimum.
Isolated from plants.
Plant pathogen: causes hypertrophies of stems, a fasciation disease of many plants.
  1. Cummins C.S., Lelliott R.A. and Rogosa M., 1975. Genus Corynebacterium Lehmann and Neumann 1896. In: Buchanan R.E. and
    Gibbons N.E. (Editors), Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore,
    602-617.
Positive results for urease and negative results for aesculin hydrolysis.
Rhodococcus fascians
(c) Costin Stoica
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