Top 20 Most Common Toxic or Poisonous Mushrooms in Wyoming

The yellow stainer grows across North America and Europe and has been imported to Australia. It can be distinguished from other common white mushrooms by the bright chrome yellow color it turns when bruised. It is known to be poisonous, causing cramps, nausea, and purging. Unfortunately, it often gets accidentally eaten as it looks similar to several edible white mushrooms.

The mower's mushroom, also referred to as the lawnmower's mushroom, is so named because it frequently crops up in lawns. The species is rather nondescript, and it is considered a member of the infamously hard-to-distinguish "Little Brown Mushroom" (LBM) family. While the mower's mushroom is not known to be toxic to humans or dogs, several of these close look-alikes are.

The cleft-footed amanita is a North American mushroom species that was once classified as the notorious Amanita phalloides (the Death cap). Although later found to be less deadly, the cleft-footed amanita is a highly variable species that is not considered safe to forage for consumption.

This tropical/subtropical mushroom is known to be toxic. If eaten it causes a very unpleasant stomachache with the risk of fatal complications. In temperate zones, flowerpot parasol is only found in hothouses and greenhouses, so the risk of accidental foraging is low, but it may occur with potted plants and indoor landscaping and pose a risk to curious children.

Entoloma quadratum is easily recognized by its pointed salmon pink cap. As the mushroom matures, the color fades. Despite its attractive look, the salmon pinkgill is considered a toxic species and should not be collected and consumed.

Common ink cap mushrooms grow in clumps from buried wood or tree stumps. They come up with such strength that they have been known to lift pavement or break through asphalt. As they age, their gills will turn black and liquefy, creating the "inky" substance for which they are named.

During the reproductive phase of its life cycle, Spinellus fusiger grows throughout the cap of the mushroom host, eventually breaking through to produce radiating reproductive stalks (sporangiophores) bearing minute, spherical, terminal spore-containing structures called sporangia. Ultimately, the spores in the sporangia are released after the breakdown of the outer sporangial wall, becoming passively dispersed to new locations via wind, water, and insects. The sporangia contain non-motile mitospores known as aplanospores. Like other Spinellus species, S. fusiger is homothallic, a condition where sexual zygospores can be produced union of branches from the same mycelium and so can be produced by the growth from a single spore.

The stinking dapperling is a small, delicate mushroom that is relatively nondescript in appearance - however, as its name suggests, it does have a powerful odor. The species is a habitat generalist, popping up in woodlands, gardens, lawns, and abandoned lots. The stinking dapperling also boasts a global distribution, being found across temperate areas of North America, Europe, Asia and the Antipodes.

The oyster rollrim lacks a stem, and its lightly fuzzy orange cap, which can grow to a width of 8 cm, will bald with age. This fungus grows in conifer woodlands throughout North America and Europe, from spring to late fall. It has no odor and is poisonous.

The black bulgar is an unusual fungus that looks a bit like black gumdrops. While some authorities classify it in an "unknown edibility" group, others claim it's a poisonous mushroom. Either way, its unappealing appearance surely makes it an easy choice not to consume the black bulgar.