Studies on Fungi Cultivated by Ants

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Abstract
A collection of 36 fungi cultivated by leaf-cutting ants has been established at The New York Botanical Garden. These fungi grow on a variety of natural media and on a synthetic medium with mineral salts, dextrose, casein hydrolysate, purine and pyrimidine bases and vitamins. Tests of the fungi for antibacterial activity were all negative againstStaphylococcus aureus andEscherichia coli. Only four isolates of ant fungi, each cultivated by a different species of ant, produced basidiocarps on oatmeal agar. Taxonomic studies indicate that these belong to the same species of fungus (Lepiota sp.). Eighteen isolates produced bromatia characteristic of the form species,Attamyces bromatificus Kreisel, one produced a mycelium with clamp connections, and thirteen produced sterile mycelia without clamped hyphae and without bromatia.

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