1. pileus

noun. a fruiting structure resembling an umbrella or a cone that forms the top of a stalked fleshy fungus such as a mushroom.


  • plant part
  • plant structure
  • cap

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Sentences with pileus

1. Noun, singular or mass
The pileus (cap) stays closed during the development process to protect the fertile tissue, gills and double-walled spores from drying up.