Fungi -- Genetics -- Congresses. : Fungal viruses : proceedings of the Symposium on Fungal Viruses, including abstracts of papers of the Symposium on Extrachromosomal Vectors in Fungi and abstracts of posters on fungal viruses / XIIth International Congress of Microbiology, Mycology Section, Munich, 3-8 September, 1978 ; edited by H. P. Molitoris, M. Hollings, H. A. Wood