A new actinomycete genus, , is described. Members of this genus have type IV cell walls (-diaminopimelic acid, D-glutamic acid, DL-alanine, muramic acid, -acetyl-D-glucosamine, D-galactose, and arabinose) and a type A whole-cell sugar pattern (D-galactose and arabinose) plus traces of madurose (3--methyl-D-galactose). No mycolic acids are present. The substrate mycelium has a tendency to fragment. The aerial mycelium bears long chains of spores, as well as sporangiumlike structures with well-defined walls. These sporangiumlike structures do not contain spores but germinate directly when they are placed on agar. The type strain of K. aridum is strain SK&F-AAD-216 (= ATCC 39323).


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