C.Brutail wrote: It's a plant cell of sort. But what kind of plant cell?
A bit about shrooms:
The basic taxon of mushrooms is the Fungi, and it has two classes:
Ascomycetes, and Bazidiomycetes. Ascomycetes are:
Eurotiales: here belongs penicilin (aspergiliaceae is the family, mold type fungi)
Eurotiales: here belongs ergot (very toxic mold type fungi, grows on rise or wheat)
Pezizales: these are bigger fungi, not mold type anymore, like morel, truffle,
Bazidiomycetes are the things, that people call mushrooms.
btw if we are in taxonomy, I can give you another hint, but this is the last one, and it is pretty helpfull:
Coniferae