Tapinella panuoides var.

ionipus (Quélet 1888) C.Hahn 1999 Paxillus panuoides Tapinella panuoides, also known as oyster rollrim,[1] and as fan pax from its former binomial Paxillus panuoides, is a fungus species in the genus Tapinella.

[2] Despite its pleasant taste, the species is poisonous.

[3] In North America it can be confused with poisonous western jack o'lanterns, edible chanterelle mushrooms, false chanterelles (Hygrophoropsis aurantiaca), Crepidotus, or Phyllotopsis.

[4] It grows on wood or in "lignin-rich humus," has little or no stalk where it emerges from the substrate, and the gills appear to be crimped, forked, or crosshatched close to the base.