A key to treat 269 genera of lichen-forming fungi including 940 species from Hungary is compiled. The key sorts lichens according to traditionally distinguished morphological groups based on vegetative and reproductive structures, fruticose, foliose and crustose thalli with apothecia and perithecia. Elongated and stalked reproductive structures are also distinguished, as well as the type of photobiont (cyanobacterium, green alga) is considered. Due to recent phylogenetical-taxonomic studies several taxa with recent nomenclature grouped under larger, morphologically related genera following the practice of published national identification keys from Germany and Great Britain. Keywords: genera, identification, lichens, morphology, taxonomy.