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Diagram of a basidiomycete stipe with an annulus and volva. In mycology, a stipe (/ s t aɪ p /) is the stem or stalk-like feature supporting the cap of a mushroom. Like all tissues of the mushroom other than the hymenium, the stipe is composed of sterile hyphal tissue. In many instances, however, the fertile hymenium extends down the stipe ...
In orchids, the stipe or caudicle is the stalk-like support of the pollinia. It is a non-viscid band or strap connecting the pollinia with the viscidium (the viscid part of the rostellum or beak). A stipe is also a structure found in organisms that are studied by botanists but that are no longer classified as plants.
The free gills are pale to golden yellow, as is the cylinder-shaped stipe, which is 8–15 cm (3–6 in) tall and 2–3 cm (3 ⁄ 4 – 1 + 1 ⁄ 4 in) wide. The ring hangs loosely and is lined above and smooth below. The base of the stipe is thicker than the top and is seated in a greyish-white cup-like volva, which is a remnant of universal veil.
Attached to the cap at several points, the stipe is 3–6 cm (1– 2 + 1 ⁄ 2 in) high and 1–5 cm (1 ⁄ 2 –2 in) wide. [18] G. esculenta has been reported to have a solid stipe whereas those of true morels ( Morchella spp.) are hollow, [ 19 ] although a modern source says it is hollow as well. [ 17 ]
An annulus is the ring-like or collar-like structure sometimes found on the stipe of some species of mushrooms. The annulus represents the remnants of the partial veil, after it has ruptured to expose the gills or other spore-producing surface. It can also be called a ring which is what the Latin word annulus directly translates as. [1]
The stipe is typically covered in brown scales at the base and finely hairy farther up. The leaf is overall 8–25 inches (20–64 cm) long, yellow-green, rather soft and thin in texture, and tapers at either end with the lowest 4-10 leaflets being generally smaller than those above. [ 6 ]
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The gills are crowded together, free from attachment to the stipe, ventricose, and up to 6 mm broad; they are white when young but turn pink with age as the spores mature. The cylindrical stipe is 30–50 mm (1.2–2.0 in) long and 2–10 mm (0.1–0.4 in) wide, and broadening towards the base.