Some 3 or 4 generations ago, in my college days I learned this fungus as Lepiota lutea. Nothing stays the same, I guess.
The change seems fitting, as this is the first time I have encountered the organism outside of a house.
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Leucocoprinus
Species: L. birnbaumii
In a croton plant in my kitchen. Apparently my aunt watered my plants too much while I was on vacation!
Leucocoprinus is a genus of fungi in the family Agaricaceae. Its best known member is the yellow pot-plant mushroom (Leucocoprinus birnbaumii), found worldwide. The type species is Leucocoprinus cepistipes. The genus has a widespread distribution and contains about 40 species.