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J Bacteriol. 1963 November; 86(5): 1101-1115
Copyright © 1963, The Williams & Wilkins Company. All Rights Reserved.

MICROMORPHOLOGY OF DERMATOPHILUS CONGOLENSIS

^a Division of Laboratories and Research, New York State Department of Health, Albany, New York

ABSTRACT

GORDON, MORRIS A. (Division of Laboratories and Research, New York State Department of Health, Albany), AND MERCEDES R. EDWARDS. Micromorphology of Dermatophilus congolensis. J. Bacteriol. 86:1101–1115. 1963.—As seen in electron micrographs of thin sections, Dermatophilus congolensis is a holocarpic actinomycete that fragments, after formation of septa in several planes, into Sarcina-like packets and then into individual cocci. Release of coccal forms from the filaments and packets is by dissolution of a capsular matrix, which is a product of degradation of the cell wall. The plasmalemma is a "unit membrane." Regularly occurring plasmalemmosomes ("onion bodies") of uniform structure are apparently related to septum formation. A typical bacterial nucleoid is seen in most sections, and ribosomes are scattered throughout the cytoplasm. Specimens for electron microscopy were prepared by a modification of Kellenberger's method.