Top 20 Most Common Toxic or Poisonous Mushrooms in Temecula

1. False parasol

Though the false parasol appears unassuming, the species is famous—or, infamous—for its toxicity. It looks unfortunately similar to Agericus campestrus, a commonly eaten mushroom, but the false parasol can be distinguished by its highly unusual green spore print. Although they are no good to eat, they can be pretty to look at. The species may grow in ring-shaped groups in meadows and on forest floors in what are sometimes called "fairy circles."

2. Western jack-o'-lantern mushroom

The western jack-o'-lantern mushroom (Omphalotus olivascens) may be the most visually striking mushroom of the forest during day and night. During the day, brilliant large orange flat caps grow from both the ground and decaying stumps. At night, these mushrooms may glow in the dark, depending on location and maturity.

3. Wolf lichen

The thallus, or vegetative body, has a fructicose shape — that is, shrubby and densely branched — and a bright yellow to yellow-green, or chartreuse color, although the color will fade in drier specimens. Its dimensions are typically 2 to 7 cm (0.8 to 3 in) in diameter. The vegetative reproductive structures soredia and isidia are present on the surface of the thalli, often abundantly.

4. Flowerpot parasol

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.

5. Oak-loving elfin saddle

6. Shaggy parasol

The shaggy parasol grows singly or in groups from spring to fall. It can be found in lawns and gardens as well as the forest. It has a tendency to cause allergic reactions. Take care with identification as it is difficult to distinguish from the more deadly Amanitas.

7. Magpie inkcap

The magpie inkcap is a striking and poisonous species of inkcap that can be found in Europe, Australia, and North America. The species has an egg-shaped cap that is typical to inkcaps, but its coloration sets it apart; white spots or splotches adorn a solid, dark brown or black background, reminiscent of the coloration of a magpie.

8. Onion-stalk parasol mushroom

This generalist mushroom, found across North America, can be found in all sorts of moist woodland settings. The species appears to be particularly fond of wood chips or mulch, and so it is often found in garden or park settings. The onion-stalk parasol mushroom, despite the word "onion" in its name, is inedible.

9. California agaricus

The california agaricus, found along portions of coastal California, is a toxic mushroom that is closely related to (and closely resembles) several sought-after, edible species, such as button mushrooms and white and brown field mushrooms. One distinguishing characteristic of california agaricus is that its flesh will begin to yellow when cut or bruised; unfortunately, this reaction is not always obvious. It is not deadly poisonous, but ingestion can cause gastrointestinal distress.

10. Mower's mushroom

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.

11. Common ink cap

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.

12. Sulphur tuft

The sulphur tuft grows on rotting wood of all types of trees; it is a particularly efficient decomposer of hardwoods. The mushrooms appear from spring to autumn and are often so tightly packed that they interfere with each other’s shape. This poisonous mushroom can cause temporary paralysis, distorted vision, and stomach pain if consumed.

13. Yellow stainer

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.

14. Yellow-staining milkcap

Like most other milkcaps, the yellow-staining milkcap will ooze a white, latex-like substance when cut or otherwise damaged, but, unlike closely related species, the latex of this mushroom will quickly turn canary-yellow when exposed to the air. Go ahead and try it out for yourself, but don't take this one home to the kitchen! The yellow-staining milkcap is toxic.

15. Pine cone Amanita

The elongated cap of the pine cone Amanita (Amanita magniverrucata) is smothered in a warty surface, with the peaks of those warts appearing darker in color. It has a very pungent odor, and although it is not toxic, this makes it quite unpalatable. The tell-tale fragrance is not present during all growth stages, so this should not be relied upon alone for identification.

16. Lilac bonnet

The lilac bonnet is common around the northern hemisphere in woodlands of all types, and can sometimes also be seen in grasslands. It is toxic to humans due to its muscarine content, a poison that can cause convulsions and death after ingestion.

17. Common earthball

With an appearance similar to a crusty potato, the common earthball blooms from acidic soils, including compacted paths on the forest floor. It matures to a yellowish tinge and is found across the northern hemisphere. It is a close cousin to bolete mushrooms but is considered to be poisonous and is never eaten.

18. Creamy russula

The creamy russula is so-called because is one of the unusual species that fruits during winter. The species' range, the wet, northwestern coast of the United States, stays cool but rarely dips below freezing during this time. Red-capped and white-gilled, creamy russulas look very similar to a host of other russala species; this species is just bitter-tasting, but some of its look-alikes are toxic.

19. Dung-loving deconica

As its common name indicates, dung-loving deconica(Deconica coprophila) is most commonly found sprouting from decaying clumps of bovine or horse dung, particularly after periods of heavy rain. Perhaps unsurprisingly, there is little information available regarding its edibility. Consumption is therefore not recommended.

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