Posted on 11 February 20182 February 2018 by David Penicillin mould on a rotting apple Patches of penicillin mould growing on the skin of a well-rotted apple. The rot had already reached the stage where there were small piles of pale blue spores below, shed from the mould. Post navigationPrevious post: Signs of spring: scarlet elf cup fungus, NewbridgeNext post: Tufted ducks, male and female, West Park lake