The OSM project is substantially more flexible in tagging that the list in the OrganicMaps phone app you are using.

Please see:
https://wiki.openstreetmap.org/wiki/Tagging_for_Foraging

Since there doesn't seem to be a good tags for mushrooms specifically, I've tagged your entries as natural=mushroom, e.g.:
https://www.openstreetmap.org/node/13762258501