Hebeloma crustuliniforme

Hebeloma crustuliniforme, commonly known as poison pie or fairy cakes, is a gilled mushroom of the genus Hebeloma found in both Old and New World countries. It is moderately poisonous.

Description
The buff-to-beige cap is 3–10 cm in diameter, convex then umbonate with an inrolled cap margin until old. The gills are pale grey-brown, with orange to brown spores and exude droplets in moist conditions. The stipe is 4–9 cm high and .5–1.5 cm thick, with a wider base. It bears no ring, while the thick flesh is white. The fungus has a radish-like smell and bitter taste.

The spores are brown, elliptical, and somewhat rough.

Similar species
Similar species include Hebeloma sinapizans and H. insigne.

Taxonomy
The species' specific name derives from the Latin crustulum ('little biscuit').

Distribution and habitat
H. crustuliniforme has been found in 18 countries, including most parts of Europe, both coasts of North America, and less frequently in Victoria, Australia.

A common mushroom, H. crustuliniforme can be found in open woodland and heathland in summer and autumn, though may also be found in winter in places with milder climates such as California. It is "by far the most common" Hebeloma found in California.

Toxicity
This fungus is poisonous, the symptoms being those of a severe gastrointestinal nature, namely vomiting, diarrhea and colicky abdominal pain several hours after consumption.