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Tropic growth of fungi within plant tissues. (a) Intercalary hyphal extension by Epichloë endophytes in elongating grass leaves [21•]. Bar represents 100 μm. (Courtesy of C Voisey.) (b) Fluorescence microscopy of C. purpurea hyphae growing within a stigmatic hair towards the ovary of a rye plant [22]. Bar represents 20 μm. (Courtesy of P Tudzynski, with permission from Blackwell.)
