Fern Finder is a dichotomous key to native ferns of US and Canada east of the Rockies. For the second edition, author Barbara Hallowell has updated range maps, based on information gathered over the past 20 years, and updated fern names. As with all the Finder dichotomous keys, a lot of information has been packed into this little book. You won’t find another field guide to ferns that approaches Fern Finder in usefulness and accuracy without costing, and weighing, a lot more.