Nitrification in vitro by a range of filamentous fungi and yeasts

A wide range of fungi including yeasts, growing on Czapek Dox medium, nitrified added ammonium and the ammonium released by urea hydrolysis. Phanerochaete chrysosporium and Hymenoscyphus ericiae were the only fungi tested which failed to nitrify. A soil yeast (isolate 1) was the most active nitrifier of ammonium in vitro, forming 0.80 microgram nitrate mg-1 biomass over the 7 d incubation period.