Re: Are there any guides in electronic format?
I'm afraid it doesn't work quite like that, Austhinker! There's a number of groups of fungi types that are visually very similar, and can only really be distinguished by spore print, and microscopic examination of spores. (To get a spore print, leave a cap, minus stipe, on a piece of card that's half-black, half-white, under an upturned bowl, overnight. Then carefully lift away the bowl and cap, and you can see the spore print on one half or other of the sheet - so long as you've made sure there's no breeze to disturb the spore pattern.) The problem is that, in several of these groups, there are both eaters and deadly poisonous mushrooms.
A portable guide would be handy to help novices identify the most easily distinguished eaters - the ones that can't be mistaken for harmful fungi - but it would be no good for taxonomy of the majority of look-alikes, and could lead to tragically incorrect identifications.
In France, every pharmacist has training in mushroom identification, and provides a free service, checking trugs of fungi for safety. Sadly, here in the UK, we're not so blessed.