Penicillium | Penicillium roqueforti | Penicillium chrysogenum | Paspalum notatum | Penicillium marneffei | Penicillium candidum |
In 1938, working with Ernst Boris Chain and Norman Heatley, he read Alexander Fleming's paper discussing the antibacterial effects of Penicillium notatum mould.
Louis Pasteur would build on this discovery, noting that Bacillus anthracis would not grow in the presence of the related mold Penicillium notatum.