The cap is somewhat reniform, thin, and from 6-12 cm.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
It is nearly semi-circular to reniform in outline, and the margin broadly crenate, or sometimes lobed.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Seed reniform, testa membranous.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera