In some the volva splits at the apex and is left as a "cup" at the base of the stem.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Where the volva is quite thick and stout it usually splits at the apex, and there is a prominent free limb, as shown in Fig.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It splits at the apex, but portions sometimes cling to the surface of the pileus.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson