It is a secotioid mushroom, meaning its hymenium takes the form of a gleba made of underdeveloped gills, completely enclosed by the cap, which never fully opens.

[3] The cap is egg-shaped to spherical, often tapering upward to form a blunt, conical point 1-7cm wide and 2-10cm tall.

The gills are contorted, irregularly chambered, and underdeveloped, making up an enclosed gleba which is white, aging to a mustardy yellow-brown.

The spores are 6.5-9.5 x 5-7 μm, globose to elliptic, green to yellow-brown, turning reddish brown in Melzer's.

Agaricus inapertus is a look-alike, although unlike C. agaricoides, it prefers forests and develops a black gleba with age.