This is the proceeding of the 5th International Workshop on Food Mycology sponsored by the International Commission on Food Mycology. The workshop took place October 16-18, 2003 in Samso, Denmark.The Fifth Workshop was attended by some 35 participants, drawn from among food mycology and related disciplines around the world. The workshop was highly successful, with papers devoted to media and methods development in food mycology, as is usual with these workshops. Particular emphasis was placed on the fungi which produce mycotoxins, especially their ecology, and through ecology, potential control measures. Sessions were also devoted to yeasts and the inactivation of fungal spores by the use of heat and high pressure. Nearly 40 scientific papers were presented over three days of the workshop, and these papers are the major contributions in these Proceedings. TOC:List of contributors.- Foreword.- Important mycotoxins and the fungi which produce them.- Recommendations concerning the chronic problem of misidentification of mycotoxigenic fungi associated with foods and feeds.- Comparison of hyphal length, ergosterol, mycelium dry weight and colony diameter for quantifying growth of fungi from foods.- Evaluation of molecular methods for the analysis of yeasts in foods and beverages.- Standardization of methods for detecting heat resistant fungi.- Ecophysiology of fumonisin producers in Fusarium section Liseola.- Ecophysiology of Fusarium culmorum and mycotoxin production.- Food-borne fungi in fruit and cereals and their production of mycotoxins.- Black Aspergillus species in Australian vineyards: from soil to ochratoxin A in wine.- Ochratoxin A producing fungi from Spanish vineyards.- Fungi producing ochratoxin in dried fruits.- An update on ochratoxigenic fungi and ochratoxin A in coffee.- Mycobiota, mycotoxigenic fungi and citrinin production in black olives.- Byssochlamys: significance of heat resistance and mycotoxin production.- Effect of water activity and temperature on production of aflatoxin and cyclopiazonic acid by Aspergillus flavus in peanuts.- Inactivation of fruit spoilage yeasts and moulds using high pressure processing.- Activation of ascospores by novel food preservation techniques.- Mixtures of natural and synthetic antifungal agents.- Probabilistic modelling of Aspergillus growth.- Antifungal activity of sourdough bread cultures.- Prevention of ochratoxin A in cereals in Europe.- Recommended methods for food mycology.- Appendix 1 - Media.- Appendix 2 - International Commission on Food Mycology.- Index.