As nouns the difference between pileus and pileipellis
is that pileus
is the cap of a mushroom while pileipellis
is (mycology) the uppermost layer of hyphae in the pileus of a fungal fruit body.
the cap of a mushroom.
the bell of a jellyfish
(meteorology) a small thin cloud attached to a cumulus cloud. A cap cloud
a conical felt hat worn in ancient Rome and Greece
The top of the head of a bird, from the bill to the nape.
(mycology) The uppermost layer of hyphae in the pileus of a fungal fruit body.