The morphology of two types of paired deep depressions situated on the ventral side of the pterothorax of Henoticus serratus (Col., Cryptophagidae) were described. The shape of the depressions and surrounding setae indicate that they function as mycangia and that the legs are used to fill them with fungal material. Glandular secretions, together with fungal material, were found inside the larger mesosternal mycangia. Culturing of fungi from the pterothorax, and to a lesser degree from prothorax, yielded the soil-living pyrenomycete Trichoderma harzianum, whereas fungi on other body parts and from walking experiments yielded fungi characteristic of contaminated samples. H. serratus is an early colonizer of burned forests and dwells under the bark of fire-killed trees. The importance of mutual relations of beetles and fungi during early postfire successions is discussed.