noun, plural pi·le·i [pahy-lee-ahy, pil-ee-ahy] /ˈpaɪ liˌaɪ, ˈpɪl iˌaɪ/ for 1, 2, 4, pi·le·us for 3.
- the umbrella or bell of a jellyfish.
Origin of pileus
Examples from the Web for pileus
The universal veil, if present at all, is seen only on the margin of the pileus like frost or silky dew.The Mushroom, Edible and Otherwise|M. E. Hard
Pileus slender, campanulate, usually striate, margin straight and adpressed to stem when young.European Fungus Flora: Agaricaceae|George Massee
The cuticle is smoky olive to fuliginous, darker when young, becoming paler as the pileus expands, but always darker on the umbo.
The pileus is smooth, quite thick and firm, convex to expanded.
They are lighter in color than the pileus and I have never observed the yellow tint in them.