Werkgroep voor Bryologie en Lichenologie (Vlaanderen) Flechtenkundliche Arbeitsgemeinschaft Nordwestdeutschland Atlas van korstmossen in Belgiƫ and Luxemburg Nordic Lichen Society British Lichen Society Estonian Lichenology Verbreitungsatlas der Flechten Deutschlands American Bryological and Lichenological Society The Lichens of North America BLAM (Middle-Europe)
Recent literature on lichens (literatuurindex) The Lichenologist The Bryologist Lindbergia Mycotaxon Archive for Lichenology and Aktuelle Lichenologische Mitteilungen
International Association of Lichenologists
Mycology.net Pictures of Tropical Lichens Checklist of the lichens of Belgium and Luxembourg Index Fungorum (namen van soorten en hierarchie) Index Herbariorum (instituutsherbaria) Lichens of Great Britain and Ireland (sleutels in het Engels)