Abstract
The presence of capsular material on cells of phase I and phase II of Xenorhabdus nematophilus and Xenorhabdus luminescens was determined by transmission electron microscopy after fixation with glutaraldehyde-lysine. Capsular material was thicker in X. nematophilus than in X. luminescens. In each species it was two to three times thicker in cells of phase I than in cells of phase II. Peritrichous fimbriae, evidenced by negative staining in phase I of X. nematophilus and in both phases of X. luminescens, were absent in phase II of X. nematophilus. Density of these fimbriae was very low, if any, in bacteria grown in liquid medium.
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