Top 20 Most Common Mushrooms in San Jose

1. Lace lichen

Lace lichen stands out for its net-like, pendulous structure, making it easily distinguishable from others. It's not a mushroom but a lichen, a unique partnership between fungi and algae. Living mainly on oak trees, it's considered a sensitive air quality indicator. Its presence often indicates good air quality, since it's sensitive to pollutants. This lace lichen plays a vital role in its ecosystem, providing shelter and food for numerous species.

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. Cramp balls

Most commonly found on the surface of dead or dying oak trees, the pathogenic fungus cramp balls(Annulohypoxylon thouarsianum) is seen as an indicator of the health of any individual oak. The rapid proliferation of Sudden Oak Death, a blight increasingly common in the northwestern United States, has led to an increase in appearance of this fungus there.

4. Turkey tail

The distinctively-striped turkey tail fungus grows on stumps and logs all over the forests of the northern hemisphere. It is, in fact, probably the most common species you will find. That doesn't mean this mushroom is plain, however; each cap is uniquely patterned. Look for bands of alternating textures as well as color.

5. Hairy curtain crust

This clustered, overlapping fungus is found all over the world, and is considered native across both the northern and southern hemispheres. Both its common name, hairy curtain crust, and its scientific name, Stereum hirsutum, aptly describe its most obvious features: it is quite tough (stereum) and the younger fruitbodies are notably hairy (hirsutum).

6. Yellow fieldcap

Yellow fieldcap can be found across Europe and North America, with dung patties or heavily-manured fields being its favorite fruiting habitat. The species sometimes goes by the common name Yellow Fieldcap because its young cap sports a bold yellow or golden hue (that color often fades as the mushroom cap matures and flattens). Yellow fieldcap is not know to be edible.

7. Oakmoss

Evernia prunastri grows shrubby on trees. The yellow-green lichen grows up to 10 cm. It consists of up to five millimeters wide shrubby branched bands with a light underside. At the edges of these open dusty (Sorale). Apothecias (with shiny brown disc) are rarely formed.

8. Blewit

The blewit mushroom grows in fallen leaves in autumn and winter, sometimes appearing in ‘fairy ring’ circles. It can be used to make a green dye when chopped and boiled in an iron pot. The scientific name, Lepista nuda, derives from Latin words meaning “bare goblet,” a reference to the shape and texture of the mushroom.

9. Golden milk-cap

Sporting a subdued yellow cap with an indentation in the center, the golden milk-cap is often found growing near oaks. They look similar to other milkcaps and russalas, but can be distinguished by a quirky characteristic: when cut, the species bleeds a thick, milky-white, latex-like substance. Golden milk-caps are not toxic but they are incredibly bitter and so are considered inedible.

10. Golden ear

The golden ear can be encountered in an unusual time of the year – winter. It is considered a parasitic fungus, as it tends to grow on the fruiting body of other fungi, particularly the Hairy Curtain Crust (Stereum hirsutum). When wet, the golden ear has a gelatinous structure, but in dry weather, it becomes tougher and crust-like.

11. Redlead roundhead

This colorful mushroom grows most commonly on woodchip mulch and in sandy pine forests of coastal areas around the world. The redlead roundhead is believed to have originated in Australia. It may look pretty enough to eat, but don’t; it is bitter, toxic, non-digestible, and likely to cause an upset stomach.

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. Tree lungwort

Tree lungwort is a green lichen that can be found in humid areas of North America, Europe, and Asia. It grows regularly on trees, rocks, and in urban areas rich with moss. It can be used as a dye. Animals may consume tree lungwort or use it as nesting material.

14. Fly agaric

In Northern Asia and Europe, fly agaric grows under trees near the winter solstice and is collected for ritual use tied to the season. Its characteristic shape and coloring are still ubiquitous in many European fairy tale illustrations and Christmas traditions. It is highly toxic.

15. Shaggy mane

The shaggy mane mushroom is commonly found in North American and European grasslands. Some peoples foraged for its young egg-shaped caps, but it has more recently been found to be a bioaccumulator of heavy metals, meaning it pulls toxic metals up from the soil where it grows. As a result, shaggy manes should not be eaten. The mushrooms usually appear in clusters or “fairy rings.”

16. Big sheath mushroom

These large white mushrooms bloom all over cleared, harvested fields, as well as pastures and roadsides. The scientific species name comes from Greek words meaning “glue” (glioio) and “head” (cephalus), in reference to the sticky surface of this mushroom’s cap. The big sheath mushroom looks so similar to the poisonous Deathcap and Destroying Angel mushrooms that it should always be left alone.

17. Split gill

Split gill(Schizophyllum commune) can be found across the globe. Uniquely, it is the only mushroom species known to display the capability to retract by movement. It is considered inedible, although not necessarily toxic. Furthermore, it is not recommended to smell this species, as the spores are capable of sprouting and growing in nasal passages.

18. Chicken-of-the-woods

Chicken-of-the-woods is a brightly-colored polypore related to the famed Chicken-of-the-Woods (Laetiporus sulphereus). The species are so closely related, that it was not until the 2000s that mycologists considered them to be distinct. Unlike its famed relative, the species is not considered a choice edible - there are conflicting reports as to its edibility, with some probable cases of gastrointestinal distress noted.

19. Leratiomyces percevalii

Leratiomyces percevalii mushrooms grow on the Pacific coast from summer to winter. They are frequently seen in urban areas, on woodchips, grassy fields, and waste areas, or along the sides of roads and trails. Very little is known about the edibility of this species, so don't risk it!

20. 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.

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