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the umbrella like head called cap or pileus,the stalk or stipe and gills which are present on the under surface of of pileus
morel
pileus-fruit body
The top of a mushroom is called the Cap.I think it is the cap, or the dome.cap
The main purpose of a mushrooms cap or"pileus" is to make and disperse the trillions of spores needed to germinate only a few more fungi.