The genus Marasmius Fr. (Tricholomataceae, Agaricales) take in fungus commonly well-known as mushrooms. It's cosmopolitan, but much more numerous in carpophore production and number of species in the tropical regions than in the temperate and frigid zones. Most frequently on wood or leaves, dead or living, more rarely among mosses or grasses on earth. A study of the representatives of the genus Marasmius occurring in the Reserva Biológica Walter Egler, Rio Preto da Eva, in the Amazon State, was carried out. The collection was carried out from December 2000 to June 2001 and the mushrooms were identified based on usual methodology for identification of Agaricales. A total of nine species were studied: Marasmius bellus, Marasmius haedinus var. haedinus, Marasmius cf.leoninus, Marasmius cf.mazatecus, Marasmius cf. ruber, Marasmius cf. setulosifolius, Marasmius tageticolor, Marasmius cf. variabiliceps var. variabiliceps and Marasmius sp. The taxa Marasmius cf.mazatecus, Marasmius cf. setulosifolius and Marasmius cf.variabiliceps var. variabiliceps are here cited for the first time from Brazil. Except of M. tageticolor Berk, all species are cited for the first time as occurring in Reserva Walter Egler. Morphological descriptions, identification-key of the taxa and illustrations are supplied.", 'en
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