Wild Mushroom Identifier: What a Photo Can and Can't Tell

A wild mushroom identifier, whether an app or a printed key, can suggest a name, but it cannot tell you a mushroom is safe to eat. Use the answer to learn what you found and to know what to tell an expert, never to decide what goes in your mouth. Both of the top-ranking identification sites say the same: Mushroom Appreciation tells readers never to eat anything based on what they read online, and mushroom.world says never to consume a mushroom based on its tool, which gives no edibility information.

Mushroom Appreciation lists eight things to record, and says identification takes far more than color and size:

• Gills, pores or teeth under the cap, and how the gills attach to the stem
• Stem: size, shape, color, hollow or solid
• Spore color, from a spore print
• Bruising: color changes or liquid when cut or handled
• Habitat: nearby trees, soil, wood or lawn
• Season
• Cap: shape, texture, color and markings
• Smell

mushroom.world's identifier relies on spore print color first, sorting gilled mushrooms into white or cream, greenish, and pink, brown or black spores, with non-gilled fungi in their own groups. It also says its database covers only a small subset of mushrooms. Some species can only be separated under a microscope (Mushroom Appreciation).

Not accurate enough to rule out poisoning. A 2023 study in the journal Clinical Toxicology compared three identification apps using digital photographs of mushrooms:

• Picture Mushroom was right 49% of the time; Mushroom Identificator and iNaturalist 35% each.
• Picture Mushroom correctly identified 44% of the poisonous specimens.
• The deadly death cap (Amanita phalloides) was misidentified twice by Picture Mushroom and once by iNaturalist.

The authors concluded the apps may be useful future tools but are not reliable enough to exclude exposure to a potentially poisonous mushroom when used alone. None of the top-ranking identifier pages cites this study. Treat any photo result, ours included, as a starting point for an expert, not an answer.

Wikipedia's article on mushroom poisoning says there are no general identifiers for poisonous mushrooms, and that beliefs about silver turning dark, bright colors, taste or animals avoiding a mushroom are unreliable. Poison Control adds that look-alikes can fool experienced people, that knowledge from one region does not carry over to another, that cooking does not make a poisonous mushroom safe, and that fumes from cooking some species can poison you.

The numbers behind the warning (Wikipedia): about 100 of the roughly 100,000 known fungi are poisonous to people, and the death cap causes the majority of fatal poisonings. Its toxin, alpha-amanitin, produces no symptoms for 6 to 12 hours, then stomach upset for about a day before liver damage begins, so people often feel better before they get worse. Mortality is about 10% with prompt treatment and 50 to 90% when patients arrive 60 or more hours after eating. Immature Amanitas can also be mistaken for edible puffballs.

University of California IPM explains that lawn mushrooms usually grow from buried construction lumber, dead tree roots or other organic matter, and that the fungi are decomposers. Fairy rings form circular green bands 1 to more than 12 feet across. Common lawn types include inky caps, which dissolve into dark liquid soon after appearing, Panaeolus foenisecii with brown gills, common in new sod, and honey-colored clusters of Armillaria mellea near dead trees and stumps.

Picking the mushrooms does not kill the fungus underground; removing buried wood can. UC IPM advises not eating wild mushrooms unless you know the species well, and removing mushrooms before children play outside, because many species are poisonous and pets can also be harmed. If a pet eats a lawn mushroom, call your veterinarian right away.

Correct identification is not the only risk. In March 2024 the CDC reported an outbreak linked to morel mushrooms served at a restaurant in Bozeman, Montana, in 2023: 51 people fell ill, 3 were hospitalized and 2 died, with symptoms usually starting within an hour. Raw morels carried a greater risk than partly cooked ones, and the CDC advised that morels be cooked before eating. This is another reason an identification result is never a green light to eat.

• In the US, call Poison Control at 1-800-222-1222 right away, even if the person feels fine, because symptoms of the deadliest mushrooms are delayed for many hours (Poison Control).
• Keep the mushroom, including any leftovers, and take photos of it and of any others still growing in the spot, so an expert can help identify it.
• Do not wait for symptoms, and do not try home remedies.
• For a dog or cat, call your veterinarian or an animal poison line.

Outside the US, call your local emergency number or poison center.

Photograph the cap from above, the underside (gills, pores or teeth), the whole stem down to its base, a cut surface a few minutes after cutting to show any color change, and the surroundings: the tree, wood or lawn it grew from. Photograph it and the app suggests a name, with free scans every day; for anything to do with eating or poisoning, take those photos to Poison Control, a doctor, or a local mycological society.

Research and drafting for this page used AI assistance. Every measurement, date, price and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.