DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Hollyhock rust fungus in a leaf. Light micrograph of a section through a hollyhock (Alcea sp.) leaf infected with the parasitic Puccinia malvacearum rust, showing the teliospores (spores, brown-red). The fungal hyphae (tubes, not seen) pierce the cells with haustoria and suck out nutrients. The telia have stalks containing two-celled teliospores, and project through the ruptured epidermis (not seen). Magnification: x138 when printed 10 centimetres wide.
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