Lichenomphalia umbellifera or the green-pea mushroom lichen is a species of basidiolichen in the family Hygrophoraceae. It is regarded as nonpoisonous. The mushroom is yellowish-tan and hygrophanous, and occurs throughout most of the year on damp soil and rotting wood. It can be found in the Northern Hemisphere, particularly in the region of the Arctic. Its cap grows up to 3 cm wide. Its stalk is 1–3 cm tall and 1–3 mm wide. The spores are white or yellowish.