DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
White rust fungus on a leaf. Light micrograph of a section through a plant leaf infected with white rust fungus (Albugo candida). Albugo is a type of parasitic oomycete (water mould) that attacks flowering plants, causing white blisters or 'rust'. The mould's hyphae (blue threads) suck nutrients from the host cell. A mass of hyphae forms the sporangiophores (blue clubs), which bud off sporangia (blue and red), formed beneath the almost ruptured epidermis (outer layer). Magnification: x70 when printed 10 centimetres wide.
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