Odd question, I know but I was trying to read up on various histories of plants and religion and mushrooms were treated vastly differently in different places. They separated them into mycophilic and mycophobic cultures but even in mycophilic cultures, I couldn't find any specific member of a pantheon that was known for them. It was mostly harvest or hunting gods and not really foraging.
EDIT: Thank you to all those who attempted to answer my question. Kinda sad there weren't any people who specialized in mythology or food history
Not a god per se, but the Kusabira Jinjya in Japan is a Shinto shrine to mushrooms.
What were you reading that talked about mycophobic and mycophillic cultures? That sounds very interesting to me! Thanks.
I haven't read it but 'the sacred mushroom and the cross' might interest you. Written by the only agnostic scholar to work on the dead sea scrolls. Sounds interesting.