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Summary.— The cutaneous diphtheroids have very varied morphological and biochemical characters which make grouping for ecological studies difficult. Several schemes have been proposed and are discussed. For convenience, the organisms are divided into lipophilic and non‐lipophilic diphtheroids, those producing porphyrins, those with some keratinolytic ability and the anaerobic diphtheroids.
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Dorothy A. Somerville (1972) studied this question.
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