There is still some time, till Fungitron – the definitive mushroom guide will be available for download, in the meantime let’s just suggest some “traditional” mushroom guides, which are available online.
Kent H. McKnight, Vera B. McKnight: Peterson Field Guides to Mushrooms (link at the end of article)
With its more than 500 mushrooms, this field guide gives a detailed insight into US fungi kingdom.
Here are a few words on Amanita species:
And this is the colour table for them:
The complete Mushroom Field Guide book is available for free for online viewing or download at: http://www.scribd.com/doc/60364737/Peterson-Field-Guide-to-Mushrooms
Or you can order it from Amazon: