Cellulomonas humilata (Actinomyces humiferus)
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
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Pathogenicity
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Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Micrococcales, Suborder Micrococcineae, Family
Cellulomonadaceae, Genus Cellulomonas,
Cellulomonas humilata corrig. (Gledhill and Casida 1969) Collins and Pascual 2000.

Historical synonym:
Actinomyces humiferus Gledhill and Casida 1969.
Gram-positive predominantly filamentous and branched cells, often with swollen
ends; in time, usually, fragment into diphtheroid or coccoid elements. Non-acid-fast.
Non-motile. Non-spore-forming.
Colonies are small, opaque, smooth, occasionally rough , convex, with a dark central
region on heart infusion agar. In liquid media growth is granular or flocculent, with a
white sediment, without turbidity. Aerobic / microaerophilic. Grows at 30 ºC, optimum.
No growth in 4% NaCl media.
The natural habitat is organically rich soil. Sensitive to lysozyme.
Undetermined.
  1. Collins M.D. and Pascual C., 2000. Reclassification of Actinomyces humiferus (Gledhill and Casida) as Cellulomonas humilata
    nom. corrig., comb. nov. Int J Syst Evol Microbiol 50, 661-663.
  2. Slack J.M., 1975. Genus Actinomyces Harz 1877. In: Buchanan R.E. and Gibbons N.E. (Editors), Bergey’s Manual of Determinative
    Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore, 660-667.
Positive results for casein hydrolysis, esculin hydrolysis, gelatin hydrolysis (weak reaction), H2S production, methyl-red reduction,
starch hydrolysis, acid production from L-arabinose, cellobiose, dextrin, fructose, galactose, gentibiose, D-glucose, maltose,
mannitol, mannose, melezitose, melibiose, raffinose, rhamnose, salicin, sucrose, starch, turanose & D-xylose.

Negative results for catalase, indole production, nitrates reduction, oxidase, tyrosine hydrolysis, urea hydrolysis, Voges-Proskauer
test, xanthine hydrolysis, acid production from adonitol, dulcitol, inositol, inulin, ribose & sorbitol.

Variable results for acid production from glycerol, lactose & trehalose.
(c) Costin Stoica
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