Does Penicillium prefer an acidic or alkaline environment?

Paul Maymi: In my mycology class, we grew it (and most other fungi) in a slightly acidic environment, ~pH 5.0. It seemed to do best in pH 4.5-5.0, and media with a more neutral pH favored bacterial growth, so other antibiotics were added if these were used to give the fungi an edge. But the penicillium will die at either pH extreme.