[2] Characteristics of Crittendenia include the tiny synnemata-like basidiomata, clamp connections, and aseptate tubular basidia from which 4–7 spores discharge passively, often in groups.

The thallus can be flat or rounded, ranging in colour from translucent white to shades of brown, often appearing darker than the host lichen.

[1] The reproductive structures of Crittendenia, the basidiomata, develop on lichens and are stalked and club-shaped, resembling small fruiting bodies.

These structures have a fleshy, waxy texture and come in colours such as whitish, pale brown, pink, or orange, often with a slightly translucent appearance.

[1] The stalk (stipe) of the basidioma is composed of parallel fungal filaments (hyphae), which are rarely branched and have few internal partitions (septa).