Variety
Bolbitius titubans olivaceus
Bolbitius titubans olivaceus. Photo: (c) Damon Tighe, some rights reserved (CC BY-NC)
Bolbitius titubans, also known as Bolbitius vitellinus, is a widespread species of inedible mushroom found in America and Europe. It grows chiefly on dung or heavily fertilized soil, and sometimes on grass.