- British Lichen Society - Advance interest in all branches of lichenology. Includes comprehensive information on British lichens.
- Churchyard Lichens - General information.
- Dutch Bryological and Lichenological Society - Species list, herbaria, and publications.
- Dutch Lichens - Photos and information about lichen biology. In Dutch and English.
- Endangered Lichens - List of species protected by law in different countries.
- Information about Lichens - Description, structure, and environmental importance.
- Introduction to Lichens - Information about lichens including fossil record, life history, ecology, morphology and systematics.
- Invasion of Pollution-tolerant Lichens - Research on the distribution of four pollution-tolerant non-native lichens in the Pacific Northwest.
- Lichen Biology - Introduction to lichens, which are stable, self-supporting associations between fungi (most commonly Ascomycota) and photobionts (algae or cyanobacteria). Intended for university students.
- Lichen Research Program, University of Maine at Fort Kent - Information about Steve Selva's research program in lichenology. Includes a photo gallery of stubble lichens under the microscope.
- LichenLand - General information for young students including synoptic key and photos.
- Lichens and Me - Personal site of Katalin Molnár with a brief description of lichens, photographs, information on the author, publications and links to sites of lichenological interest.
- Lichens of North America - Information about lichen biology, lichens and wildlife, lichens and people, and the book of the same title, which was published in 2001.
- Lichens.de - Photos of lichens taken during British Lichen Society field trips in Britain. Contains general information and related links.
- Looking for Lichens - Weblog with photos and descriptions.
- New Zealand Forest Lichens - Photographs, general information, identification and related links.
- North American Lichen Checklist - List of cumulative updates to the most recently published North American checklist by Esslinger and Egan (1995).
- Queensland Lichens - General information on subtropical lichens from Queensland, Australia. Includes keys to genera and species, and glossary.
- Rhode Island's Foliose and Fruticose Lichens - Habitat notes, distribution maps, and color photographs of over 90 species of macrolichens by Don Flenniken.
- Roccella - Lichen genus found in Venezuela.
- Taxonomy of Philippine Lichens - Brief information and links by researcher Isidro T. Savillo.
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