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As formigas cortadeiras mostram preferência por algumas espécies vegetais, as quais são constantemente desfolhadas, enquanto outras não são atacadas, embora sejam abundantes e localizadas próximas ao ninho. As formigas dos gêneros Atta e Acromyrmex cortam plantas e transportam pedaços para os formigueiros. O material vegetal é usado para o cultivo do fungo Leucoagaricus gongylophorus, do qual se alimentam. Vários trabalhos utilizando extratos de plantas têm sido realizados para avaliar o efeito sobre o desenvolvimento do fungo simbionte. O objetivo deste trabalho foi avaliar a influência de meios de cultura acrescidos de diferentes extratos sobre o crescimento do fungo L. gongylophorus. Fungos das espécies Acromyrmex ambiguus, Acromyrmex crassispinus, Acromyrmex heyeri e Acromyrmex lundi foram inoculados nos meios Ágar Nutritivo e BDA, ambos acrescidos de melaço e de extratos de azevém (Lolium multiflorum Lam.), tifa (Typha angustifolia L.) e formiga (Atta sexdens piriventris). O meio Pagnocca foi utilizado como padrão. As placas foram mantidas em câmaras climatizadas à temperatura de 25 + 1°C e escotofase de 24 hs, por um período de 49 dias. O crescimento fúngico foi avaliado com base no diâmetro da colônia, sendo este avaliado em intervalos semanais, totalizando sete avaliações. Também foi avaliado o peso seco do fungo aos 53 dias. Os resultados mostraram que o fungo cultivado por diferentes espécies de formigas tem crescimento diferenciado em meios de cultura com diferentes extratos. The cutter ants show preference for some vegetable species, which are constantly defoliated, while others are not attacked, although they are abundant and located close to the nest. The ants of the goods Atta and Acromyrmex cut plants and they transport pieces to the anthills. The vegetable material is used for the cultivation of the mushroom Leucoagaricus gongylophorus, mushroom from of which theyfeed. Several works using extracts of plants have been accomplished to evaluate the effect on the development of the mushroom symbiont. The objective of this work was to evaluate the influence of added culture means of different extracts on the growth of the L. gongylophorus mushroom. Where mushrooms of the species Acromyrmex ambiguus, Acromyrmex crassispinus, Acromyrmex heyeri and Acromyrmex lundi were inoculated in the means Nutritious Ágar and BDA, both added of molasses and extracts of Lolium multiflorum Lam., Typha angustifolia L. and ant (Atta sexdens piriventris). The Pagnocca medium was used as pattern. The plates were maintained in cameras acclimatized to the temperature of 25 + 1°C and 24 hours of darkness, for a period of 49 days. The fungal growth was evaluated with base in the diameter of the colony, which was accomplished with weekly intervals, totalizing seven evaluations. Also the dry weight was evaluated from the mushroom to the 53 days. The results showed that the mushroom cultivated by different species of ants has differentiated growth in culture means with different extracts

Crescimento do fungo simbionte de formigas cortadeiras do gênero Acromyrmex em meios de cultura com diferentes extratos