Enumeratio critica lichenum europaeorum, quos ex nova methodo digerit Ludov Schaerer, Ludov. Emanuel, 1785-1853 creator text book Bernae Sumtibus Auctoris Excudebat Officina Staempfliana 1850 1850
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LAT Botany Europe Lichens QK590 .S29 https://www.biodiversitylibrary.org/bibliography/51381 6296006 10.5962/bhl.title.51381 Library, U.S. Dept. of Agriculture