In winter and spring small concretions in the form of plates are often met with in the branches of the pelvis, having been formed and molded in the confined space between the projecting papilla and the surrounding cuplike branch of the pelvis.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The pileus is thin, bell-shaped, then convex, and depressed at the center, with a papilla usually in the center, finely striate on the margin, and slightly viscid.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
When the conidia are sown on water they rapidly absorb the moisture, and swell; the centre of one of the extremities soon becomes a large obtuse papilla resembling the neck of a bottle.
"Fungi: Their Nature and Uses"
Mordecai Cubitt Cooke