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In the industrialization process of cotton lint to produce quality fabrics, the fiber needs to present extrinsic and intrinsic characteristics that enable it to produce high quality yarns. The intrinsic characteristics are genetic attributes while extrinsic define the degree of purity of the product and it is result of the production system, especially the harvest and storage. During this stage, the fiber is exposed to physical and biological agents that cause loss in quality with emphasis on fungi, important contaminants. The contamination can be caused by boll rot symptoms at maturity and induce the degradation of cellulose fiber and change in the color that reduce the quality. The purpose of this research was to identify the fungi associated with cotton lint and seeds with fuzz from growing areas of Brazil and some countries. Samples of lint from the United States, Ivory Coast, Greece, Turkey and Cameroon and cotton seeds from Rio Grande do Norte, Mato Grosso, Bahia, Goiás and Ceará were subjected to humid chambers in Petri dishes during 48 h. In order to identify the fungi associated to samples, it was isolated in culture medium of Malt Extract Agar. The samples from United States and Tukey presented more contamination. The main fungi associated with lint were Fusarium spp, Penicillium spp, Phomopsis spp, Aspergillus niger and Rhizopus sp. Seeds with fuzz represents an important way of spread of pathogens. Key-words: Pathogen, Fiber, Contamination, Storage

Fungi associated to lint and cotton seeds with fuzz