A. niger colonies grown at different concentrations of PLA and LA. Pictures show 90 mm petri dishes. Concentrations of PLA and LA in mM are given at the top right corner of each subfigure. Scale bars where present = 1 mm. Photos taken after 7 days (A) and after 14 days (B) of spores assayed with a 1:1 DL-PLA mixture, L-PLA after 7 days where no growth was observed at 45 mM (C), and D-PLA after 7 days (D).