It has light-dark ringed antennae at the base, a yellow head with a darkened center and a broad yellow tip at the end of the palps.

Grey with brown head capsule and prothoracic plate.

All the information on the biology of this species needs to be taken with serious care because of its similarity with the other Denisia species.
The egg is oviposited on dead wood or fungus.
The larva has possibly a two-year cycle. It pupates in the feeding place during April–May.
The adults rest during the day on tree trunks and come to light, but not often. They also have been observed flying around in the early morning hours and at dusk.

The larva feeds on fungus under dead wood or bark of various living trees, with a preference for conifers like Abies, Larix, Picea, Pinus, but also on deciduous species like Betula and Acer. It has also been recorded from fungi belonging to the family Coriolaceae growing on the trunks of Quercus and Betula. Fungus species include are Daedalea quercina, Fomes fomentarius, and Piptoporus betulinus.

Preferably coniferous or mixed forests, where a lot of old or decaying wood is present, especially of Betula.