Please do check the current status of your chosen location before you go foraging, as over harvesting means collecting from some places is now illegal – also, read guidelines on at least two reputable sites from your country before you go – nobody wants you to poison yourself by mistake.
Good UK site, with UK law explained on this page
My favourite mushroom site
Mushrooms of Europe and North America, but only listed under latin names – over 3000 images –
Absolutely brilliant site with a database of over 7000 useful plants from around the world, including uses and contraindications