Top 20 Most Common Mushrooms in Wisconsin

This shelf fungus can live for several consecutive years and can be dated by the growth ridges seen on its dark surface. Artist's conk grows in tiered groups at the bases of oak, beech, and conifers, as well as deadwood. When its spores release, they cover the area with visible brown dust. Scratches in the white undersurface create dark lines.

The milk-white toothed polypore (Irpex lacteus) is a tough polypore that has jagged, tooth-like ridges on its underside. Considered a "crust fungus," this species often coats the surfaces of dead branches and tree boles. A hardy generalist, the milk-white toothed polypore can be found in remote and urban areas alike. It has a global distribution, being found just about anywhere temperate forests are located.

This shelf or bracket mushroom occurs on the wood of conifers and hardwoods around the world, either singly or in groups. Young resinous polypore fruitbodies are moist with a red sap-like substance that may form droplets around the edges; as they mature they dry out into a darker, tougher texture with a resinous exterior.

Unlike other jelly mushrooms, which are typically found on fresh deadwood, white jelly fungus grows on well-decayed wood from hardwood trees. Its fruiting body is indeed white, fading to muted brown hues with age. Its shape has garnered a wide range of comparisons, from brains to popcorn to coral.

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.”

The orange mycena is a bold little mushroom that is often found growing in large clusters on dead hardwoods. The species can be found in moist forests across eastern North America. Some of its orange-red pigment may rub off and stain skin upon handling, so this mushroom is best left alone.

The vividly-colored fruitbodies of cedar-apple rust (Gymnosporangium juniperi-virginianae) might be mistaken for flowers, from a distance. Upon closer inspection they can be identified as fungal growths attacking the fruit of cedar trees. Their microscopic spores can travel up to an astounding 5 miles when carried on the wind and infect cedars quite far away, weakening the trees as they grow.

The fruit body, or crust, of Xylobolus frustulatus has a woody texture and is perennial. It is mostly 1–2 mm thick, although it can be considerably thicker. The crust is frustose (cracking into small, angular polygons), and infrequently curled at the edges. The upper surface is zonate (appearing to have multiple zones of color or texture), and more or less smooth. The hymenial surface is smooth to the naked eye, although long soft hairs can be seen when viewed with a microscope. These 'hairs' are protruding acanthocystidia (cystidia bearing a few projections near the tip) and hyphae. Young layers are pale ochraceous, while older ones dull to deep brown. The fungus is inedible, and lacks any distinctive taste or odor. The hyphal system is monomitic, meaning that there are only generative hyphae (relatively undifferentiated hyphae that can develop reproductive structures) are present. These vertically arranged, short-celled hyphae form transitions to acanthocystidia, and have a diameter of about 3.5–5 µm. They are sparsely branched, and hyaline (translucent) to yellowish-brown, although those in older layers may be more strongly pigmented. Other hyphae (such as in the trama) are few or absent, although they can be most readily observed in very thin sections. Measuring 3–5 µm wide, they are vertically arranged, thin to moderately thick-walled, and form transitions to pseudocystidia. All of the hyphae of X. frustulatus lack clamp connections. Pseudocystidia (sterile structures arising deep in the subhymenium and protruding into the hymenium) are rare. Thin to moderately thick-walled, they rarely project above the basidia and acanthocystidia. The acanthocystidia are numerous, and have dimensions of 25–30 µm long by 4–5 µm wide. The basidia (spore-bearing cells) are shaped like long clubs, four-spored, and measure 25–30 by 4–5 µm. They are smooth or have a few basal protuberances (acanthobasidia). The spores are short-ellipsoid in shape, thin-walled or with a slight wall thickening, smooth, typically measuring 4.5–5 by 3–3.2 µm. They have a distinct amyloid reaction.

Often found at the base of oak trees, this clustered fungus grows in distinctive rosettes. It attacks the roots of living hardwood trees. Hen-of-the-woods is considered edible when harvested young, and is cultivated in Japan on top of compressed sawdust.

The name says it all! This species' most distinguishing feature is its pores, which are six (or sometimes four) sided and give the mushroom's undersides an almost honeycomb-like appearance. Found across North America, Asia, Australia, and Europe, hexagonal-pored polypores prefer to grow on dead hardwood trees. Most sources consider this mushroom to be inedible, though non-toxic.