Y. Kinoshita et al., Influences of nitrogen sources on usnic acid production in a cultured mycobiont of the lichen Usnea hirta (L.) Wigg., BIOS BIOT B, 65(8), 2001, pp. 1900-1902
Effects of the nitrogen sources in the medium for the production of seconda
ry metabolites in lichens were examined. The usnic acid production by a myc
obiont of the lichen Usnea hirta was higher in the liquid medium containing
ammonium and nitrate ions than in those containing amino acids..