Stipe (mycology)

Stipe (mycology)

Illustration of a stipe with a ring and volva

In mycology, the stipe is the stem or stalk-like feature supporting the cap of a basidiocarp, or fruiting body, of a fungus. The stipe is an important morphological feature used in the identification and classification of mushrooms.

Structure

The stipe is typically cylindrical and can vary greatly in length, thickness, and texture. It may be solid or hollow, and its surface can be smooth, scaly, or fibrous. The stipe may also have various structures such as a ring or volva, which are remnants of the universal veil that covers the immature mushroom.

Ring

The ring, or annulus, is a circular band of tissue that encircles the stipe. It is a remnant of the partial veil that covers the gills or pores of the mushroom during its development. The presence, absence, and characteristics of the ring are important for identifying different species of mushrooms.

Volva

The volva is a cup-like structure at the base of the stipe, formed from the remnants of the universal veil. It is a key feature in identifying certain groups of mushrooms, such as those in the genus Amanita.

Function

The primary function of the stipe is to elevate the cap above the substrate, facilitating the dispersal of spores by wind or other means. The height and structure of the stipe can influence the effectiveness of spore dispersal.

Variations

Stipes can vary widely among different species of fungi. Some mushrooms, such as those in the genus Coprinus, have very fragile stipes that disintegrate as the mushroom matures. Others, like the Boletus, have thick, robust stipes that support large caps.

Related pages

• Cap (mycology)
• Gills (mycology)
• Spore
• Fruiting body
• Amanita