In many species their walls become gelatinized, covering the outside of the pileus with a viscid, slimy, or glutinous layer, often called pellicle.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Fruit, 2 seeds covered by the pellicle of the ovary.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
When sufficient has been obtained the grain is put again in the mortar and pounded to remove the pellicle.
"The Bontoc Igorot"
Albert Ernest Jenks