Wild Mushrooms of North America and Europe seems to be the best mushroom foraging app currently available, though it's important to note that you should never gather mushrooms for eating if you are not very familiar with edible and poisonous mushrooms or with an expert who is.
One look at the extensive database in this app and you can see how similar many poisonous mushrooms look to edible mushrooms.
The developer says:
This application features the most complete series of some 2,660 photographs of over 1,560 Wild Mushrooms and other fungi. It includes edible, hallucinogenic, poisonous mushrooms, truffles and brackets... Apart from the detailed photographs that show each mushroom from many different angles. A lot of other helpful information is included to help with identification; descriptive keys, details of size, shape, color, habitat, there is a sign on each picture to quickly give you the idea of danger or edibility. Many different sorts and groups of mushrooms are included; cup fungi, puffballs, tree brackets, truffles and other underground forms. The common names of the different mushrooms are also included together with French and German and other important names, the Latin names are all included.
Some of the features include:
* No internet connection needed
* Detailed texts on over 1,560 mushrooms including scientific names, synonyms (including European names)
* Texts include details of microscopic analysis of spores for greater accuracy of identification
* Over 2,660 photographs, all zoomable using both tap-to-zoom or standard pinch-zooming
* Full database list with facility to search texts to find strings (e.g. common names)
* Search by visual appearance (Visual Key)
* Search by over 50 individual mushroom attributes with numbers of exact and partial matches returned customisable (Easy Key)
* Color-coded indicator for at-a-glance check of edibility.
* User notes feature that allows you to add your own personal information for any mushroom. A search can be made that returns only those mushrooms with a user note attached.
One issue I have with the app is that I've been unable to find a way to search by common nicknames, such as morel or chicken of the woods. Indeed, morels (Morchella genus) are not listed as morels even as nicknames or synonyms. Morchella vulgaris, Morchella elata and Morchella esculenta are all listed but their common nicknames such as black morel are not.
That said, this is an incredibly thorough wild mushroom app with an impressive amount of information.
Wild Mushrooms of North America and Europe is available for iPod and iPhone and sells for $1.99. It is also available in a free Lite version.