In the second type the ring is present while the volva is absent, as in the common mushroom, Agaricus campestris, and its close allies; in the genus Lepiota, armillaria, and others.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
In the genus armillaria the inner veil which forms a ring on the stem is present.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It then corresponds to armillaria among white-spored agarics, and Stropharia among the purple-brown-spored ones.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson