Inspired by Alexandar Fleming, I studied a mildewed carrot found in my refrigerator. The orange balls are carrot cells. And the black fibers are the mildew. And the black spots seem to be the cell body of the mildew. The black fibers seem to wind on the carrot tissue and decompose the tissue. A further study is to explore how the mildew decompose the carrot. It is highly probably that the mildew generate hydrolyses to decompose. This hydrolysis may be useful to decompose the organic rubbish. The scale bar was by imaging a 5 μm nylon filter and taking the average over several holes.