Abstract
An artificial key for the identification of 218 lichen-forming, parasitic, parasymbiotic and saprophytic fungi reported as occurring on lichens in the British Isles is provided. Agyrium flavescens Rehm, Cyphelium marcianum B. de Lesd., Scutula krempelhuberi Körber and Stigmidium solorinaria (Vainio) comb. nov. are reported from the British Isles for the first time, and three further new combinations are made: Bacidia killiasii (Hepp) comb, nov., Pleospilis ascaridiella (Nyl.) comb. nov. and Polycoccum gelidaria (Mudd) comb. nov. References to publications in which further information on the species can be found are included. Illustrations of the spores of 141 species and an index to the names of fungi and hosts are also presented.

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