The veil is double like that of Agaricus placomyces, the upper or inner layer remaining as a membrane, while the lower or outer layer is split radially and remains in large patches on the lower surface of the upper membrane.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It is always thick, and has an outer thin coat or membrane, and an inner membrane, while between the two is a thick layer of gelatinous substance, so that the wall of the volva is often 3-6 mm.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
In many genera the veil consists of a delicate membrane which tears away from the stem and hangs in flakes to the margin of the pileus.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson