General
| Ectomycorrhizae: DEEMY: Identification (dynamic) | Ludwig-Maximilians-Universität München – Systematische Mykologie | |
| Fungal Identification Keys | European Mycological Association | |
| Illustrated Keys to Epiphytic Lichens of Various Parts of Italy (dynamic) | KeytoNature - Dryades | |
| Lichen Key Archive (listing) | University of Oslo, Botanical Museum | |
| Macrofungi of Costa Rica – Keys to Species (dynamic) | New York Botanical Garden | |
| Key to Major Groups of Mushrooms | Michael Kuo | |
| MycoKey (dynamic) | University of Århus, Department of Systematic Botany | |
| Bestimmungsschlüssel verschiedener Pilzarten (link collection) | Pilzewelt.de |