Pleurotus ostreatus
Many terrestrial gastropod mollusks are known to feed on fungi. It is the case in several species of slugs from distinct families. Among them are the Philomycidae (e. g. "Philomycus carolinianus" and "Phylomicus flexuolaris") and "Ariolimacidae" ("Ariolimax californianus"), which respectively feed on slime molds (myxomycetes) and mushrooms (basidiomycetes). Species of mushroom producing fungi used as food source by slugs include milk-caps, "Lactarius" spp., the oyster mushroom, "Pleurotus ostreatus" and the penny bun, "Boletus edulis". Other species pertaining to different genera, such as "Agaricus", "Pleurocybella" and "Russula", are also eaten by slugs. Slime molds used as food source by slugs include "Stemonitis axifera" and "Symphytocarpus flaccidus". Some slugs are selective towards certain parts or developmental stages of the fungi they eat, though this behavior varies greatly. Depending on the species and other factors, slugs eat only fungi at specific stages of development. Moreover, in other cases, whole mushrooms can be eaten, without any trace of selectivity.