the app I've got loaded on my phone is this one: https://play.google.com/store/apps/details?id=com.mushroom.shroomify&hl=en_GB&gl
=US

I like it because it loads it's own database and does not need to be connected to any network for the app to work.

It's not a huge database, but it does cover all the common edible ones - and thats what you NEED to know.

and you can actually filter fungi by country and month/season  as well.

For a free app it's really rather good.