A revision of the epiphytic species of theLecanora subfuscagroup (Lecanoraceae, Ascomycota) in the Czech Republic

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Abstract
During a revision of epiphytic species of theLecanora subfuscagroup in the Czech Republic, nine taxa were recorded.Lecanora cinereofusca, although reported for the first time from the country here, is considered to be extinct, as isL. horiza. Lecanora circumborealishas been excluded from the list of Czech lichens.Lecanora rugosellaandL. subrugosarespectively are regarded as extreme morphological forms ofL. chlaroteraandL. argentata, ecologically derived through nutrient enrichment (eutrophication).Lecanora laevisis regarded as a morphotype ofL. horiza. An identification key is provided. The importance of the amphithecium and cortex type as taxonomic characters is discussed in detail. Several new secondary metabolites belonging to the terpenoids, discovered during an investigation of lichen compounds, proved to be taxonomically important. The abundance ofL. allophanaandL. chlaroterahas decreased during the second half of the 20th century, butL. pulicarishas expanded. The main reasons for these changes are air pollution and acidification of substrata;L. pulicaris, for example, formerly a predominant lichen on acid-barked trees, today grows mainly on trees with slightly acidic or subneutral bark.

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