The fungi of the order Uredinales are classified into 13 families, with approximately 130 genera and 6000 known species. They are phytopathogens that cause rust, presenting varied symptoms, such as leaf spots, pustules, galls, and cankers. They are pleomorphic fungi, obligate parasites and present a high specificity in relation to their hosts. The objective of this work was to identify specimens of rust parasites of plants of the class Liliopsida, from collections in the Caxiuanã National Forest. The identification of Uredinales was based on the hosts, morphological analyses of fungal microstructures, specialized literature and comparisons with specimens deposited in herbaria. For microscopic observations, semi-permanent slides of sera and spores were prepared, mounted in lactophenol solution and heated. A total of 68 host plant specimens with rust were examined, classified into 15 genera from 8 plant families: Araceae, Arecaceae, Cyperaceae, Dioscoreaceae, Heliconiaceae, Marantaceae, Poaceae, and Smilacaceae. The Uredinales specimens studied were identified in 17 species, classified in 4 families of Uredinales: Raveneliaceae, Pucciniaceae, Chaconiaceae and Phakopsoraceae, representing six teleomorph genera with 13 species, and one anamorph genus with four species. From the results obtained, descriptions, illustrations, identification keys, incorporation into the João Murça Pires herbarium (MG) and computerization in Brahms software were performed. Puccinia bambusarum Arthur was the best represented species, with 13 specimens identified, followed by Chaconia sp. (10) and Sphenospora smilacina Sydow (10). The Cerrado species the palm and Hennen & year, in this work has the first citation for the host genus Maximiliana
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