DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Penicillium mould. Light micrograph of a section through an orange rind infected with Penicillium sp. blue mould fungus, showing fungal hyphae and conidiophores (pink and purple) with spores (red). This saprophytic mould produces spores that germinate and pierce the rind of the orange. They then produce hyphae (tubular, purple), which infect the cells of the orange and suck out nutrients. The hyphae then pierce the rind with stalked conidiophores that produce rows of conidiospores on the outer surface of the rind, which are dispersed by the wind. Penicillium is used to produce penicillin, an antibiotic. Magnification: x70 when printed 10 centimetres wide.
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