Abstract
Either gaseous ammonia or ammonium salts directly control the size of fruiting bodies in Polysphondylium pallidum and a variant of Dictyostelium discoideum. However, the fruiting bodies of D. discoideum remain constant in size over a wide range of ammonia concentrations. In P. pallidum high concentrations of ammonia will induce microcyst formation, a developmental pathway that bypasses normal aggregation and fruiting. The effective concentrations of ammonia are within the range given off by the amoebae, and therefore, ammonia could conceivably be a controlling factor in slime mold development in nature.
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