Source: http://ontarioferns.com/booklist/index.php
The Ferns of Grey & Bruce Counties
Bruce-Grey Plant Committee (Owen Sound Field Naturalists)

An excellent book for identifying ferns of Ontario. HIGHLY RECOMMENDED, EXCELLENT for newcomers. This is THE book to have for identifying ferns in Ontario.
Even though this book focuses on the ferns of the Grey-Bruce region, most (but not all) of the ferns of Ontario are included. Features photographs, silhouettes, and descriptive text on each fern species. 120 pages.
Info on how to obtain this book: www.osfn.ca/pubs_osfn.html