Plage (mycology)

An overview of the mycological term "plage" as it relates to fungi.

Plage (mycology)

Galerina marginata showing distinct plages on the cap.

In mycology, the term plage refers to a distinct area on the surface of a fungal structure, such as the cap of a mushroom, that differs in color or texture from the surrounding tissue. Plages are often used as identifying features in the classification and identification of various fungal species.

Characteristics

Plages can vary significantly in appearance, ranging from subtle discolorations to prominent patches that are easily visible to the naked eye. They may be caused by differences in pigmentation, surface texture, or the presence of specific fungal structures such as cystidia or spores.

Color

The color of a plage can be influenced by several factors, including the type of pigment present, the age of the fungal specimen, and environmental conditions. Common colors observed in plages include white, yellow, brown, and black.

Texture

The texture of a plage may be smooth, rough, or even hairy, depending on the underlying structure of the fungal tissue. Some plages may appear as raised or depressed areas on the surface of the cap.

Function

The biological function of plages is not always clear, but they may play a role in spore dispersal, protection from UV radiation, or camouflage. In some cases, plages may be a result of pathogenic interactions or environmental stress.

Identification

Close-up of Galerina marginata cap with visible plages.

Plages are important diagnostic features in the identification of certain fungal taxa. Mycologists often use the presence, absence, and characteristics of plages to differentiate between closely related species. For example, the presence of a distinct plage on the cap of Galerina marginata can help distinguish it from other similar-looking species.

Related pages

• Mycology
• Fungal morphology
• Mushroom
• Galerina marginata