Hygrocybe is a genus of agarics (gilled fungi) in the family Hygrophoraceae. Hygrophorus is a genus of agarics (gilled mushrooms) in the family Hygrophoraceae. Immature gilled species still contained within their universal veil can be look alikes for puffballs. Pleurotus populinus, the aspen oyster mushroom, is a gilled fungus native to North America. These gilled mushrooms are characterised by the brittle flesh of their fruitbodies. Cuphophyllus virgineus is a species of agaric (gilled mushroom) in the family Hygrophoraceae. Porpolomopsis calyptriformis is a species of agaric (gilled mushroom) in the family Hygrophoraceae. Pleurotus citrinopileatus, the golden oyster mushroom ("tamogitake" in Japanese), is an edible gilled fungus. Lepiota is a genus of gilled mushrooms in the family Agaricaceae. Psilocybe ( ) is a genus of gilled mushrooms, growing worldwide, in the family Hymenogastraceae. The family, also commonly called the amanita family, is in order Agaricales, the gilled mushrooms. The first report of a gilled mushroom fruiting underwater is "Psathyrella aquatica". The Neritimorpha are a group of primitive "prosobranch" gilled snails which have a shelly operculum. Some gilled mushrooms in the order Agaricales have the ability to release billions of spores. Leucocoprinus birnbaumii is a species of gilled mushroom in the family Agaricaceae.