- A Guide to Lichens on Twigs (with fully illustrated multi-access key)
- Chemicals for Lichen Identification (British Lichen Society)
- An Introduction to Lichens (New York Botanical Society)
- Lichen Collection and Identification (U.S. Forest Service)
- The Lichens of British Columbia Illustrated Keys Part 1 – Foliose and Squamulose Species Part 1 (downloadable)
- The Lichens of British Columbia Illustrated Keys Part 2 – Fruticose Species (downloadable)
- Lichen Key Archive
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