Grandparent might be referring to Agaricus bisporus [0]. At least in my and some of the neighboring countries' languages we refer to these as <local translitera

Grandparent might be referring to Agaricus bisporus [0]. At least in my and some of the neighboring countries' languages we refer to these as <local transliteration of champignons>. [0] https://en.wikipedia.org/wiki/Agaricus_bisporus https://en.wikipedia.org/wiki/Agaricus_bisporus