Third world list of cetrarioid lichens: A databased tool for documentation of nomenclatural data-lessons learned

The third version of the world list of cetrarioid lichens contains 572 names representing 149 accepted species. It is presented in a new, electronical form, based on a FileMaker-powered database, allowing users to view data in different sets and to perform searches. Type information is added for most of the names, and new information regarding the phylogenetic status of accepted taxa is introduced. Five global taxonomic databases (Catalogue of Life, Encyclopedia of Life, Index Fungorum, LIAS, MycoBank) are compared by scanning the availability of mainly nomenclatural data of 30 selected cetrarioid names (10 accepted names, 10 homotypic and 10 heterotypic synonyms); the significance of digital web resources is discussed.