All phases of ontogenesis of Tilletia caries were found in combined suspension and callus culture of the wheat and causative agent of common bunt of wheat. Newly formed spores were observed on calluses of the susceptible species Triticum aestivum and resistant species T. timopheevi within 90 and 120 days after inoculation, respectively, which can be used for their production in the laboratory. On the other hand, susceptibility of the callus culture of the resistant species T. timopheevi suggests different responses of the callus cultures and vegetating plants to the pathogen. The capacity of Tilletia caries of growing on callus culture of T. timopheevi indicates to the possibility of overcoming a resistance barrier of the "timopheevi" type, which would allow a study of this phenomenon for selection purposes.