SUMMARYThe conidial stage ofConiochaeta ligniariais described. In morphology, it resembles the imperfect stages of several otherConiochaeta species.A typical mitotic cycle was found to be operative in the hyphae. The chromosome number, based on mitotic prophase (prometaphase) and metaphase counts, tentatively is 6. Anaphase irregularities, apparently frequent, are described.