Nomenclatural synopsis of the Old World's “manna” lichens (Aspicilia, Megasporaceae)

In a synopsis of the nomenclature of the Eurasian and African species of the so-called vagrant manna lichens twelve species are recognized. The group is included in the genus Aspicilia. Most of the accepted and synonymous names are typified. Special attention was paid to the numerous infraspecific entities published by the Russian lichenologists A.A. Elenkin and K.S. Mereschkowsky. The new combination Aspicilia fruticulosofoliacea (Elenkin) Sohrabi is proposed.