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Agaricus campestris is the "true" mushroom. The full grown expanded plant is somewhat umbrella like. The central stalk supports a thick cap.

Agaricus Campestris

Agaricus campestris is the "true" mushroom. The full grown expanded plant is somewhat umbrella like.…

Pictured is a section of a gill of <i>agaricus campestris</i>. (tr) trama, (sh) hymenium, (b) basidium, (st) sterigma, and (sp) spore.

Agaricus Campestris Gill

Pictured is a section of a gill of agaricus campestris. (tr) trama, (sh) hymenium, (b) basidium, (st)…

Pictured is the pure culture of <i>agaricus campestris</i> spawn.

Spawn of Agaricus Campestris

Pictured is the pure culture of agaricus campestris spawn.

Shown is a pine root attacked by the mycelium of agaricus melleus. The mycelium is in the form of rhizomorpha fragilis.

Agaricus Melleus

Shown is a pine root attacked by the mycelium of agaricus melleus. The mycelium is in the form of rhizomorpha…

Common mushroom is the common name of agaricus campestris. Mushroom is the popular name given to a group of fungi.

Common Mushroom

Common mushroom is the common name of agaricus campestris. Mushroom is the popular name given to a group…

Fly agaric is the common name of agaricus mascarius. This is a large mushroom with a red cap. The cap is studded over with pale warts.

Fly Agaric

Fly agaric is the common name of agaricus mascarius. This is a large mushroom with a red cap. The cap…

These spores of fungi are species of the genus Agaricus. Most of these species have colorless spores but some are pink, brown, or black.

Spores of Fungi (Agaricus)

These spores of fungi are species of the genus Agaricus. Most of these species have colorless spores…

"Portions of gills of a fungus (Agaricus). A, slightly magnified; B, one of the parts of A, more magnified. hym, hymenium; h, central layer." -Bergen, 1896

Fungus Gills

"Portions of gills of a fungus (Agaricus). A, slightly magnified; B, one of the parts of A, more magnified.…

The name mushroom is generally applied to those soft white umbrella-shaped growths considered good to eat. It is always dangerous to eat mushrooms gathered in the woods by anyone other than an experienced collector.

Agaric mushroom

The name mushroom is generally applied to those soft white umbrella-shaped growths considered good to…

The agaricus mushroom has a dotted cap. These mushrooms may be used for medicinal purposes.

Agaricus Mushroom

The agaricus mushroom has a dotted cap. These mushrooms may be used for medicinal purposes.

When mushrooms are about half way in development they are said to be in the "button" stage. They are often referred to as button mushrooms.

Mushrooms in the Button Stage

When mushrooms are about half way in development they are said to be in the "button" stage. They are…

St. George's Mushroom is the common name of agaricus gambosus. This species appears in the spring. This mushroom is edible.

St. George's Mushroom

St. George's Mushroom is the common name of agaricus gambosus. This species appears in the spring. This…