This book records the contributions presented at the XIIth Interna- tional Congress of Microbiology, Mycology Section, held in Munich on 3-8 September 1978. All the papers given at the Symposium (no. 33) on Fungal Viruses, and at the Round Table Discussion (RTD 1) are reported in full, and the paper on fungi as vectors of plant viruses by R.N. Campbell (who was unfortunately unable to attend the Congress) has also been included (Part A). Much of the current work with viruses in fungi involves genetic studies and virus-host gene interactions; for this reason, the Sympo- sium (no. 32) on...