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Front cover illustration

Scanning electron micrograph showing fragments of mature Colletotrichum higginsianum appressoria remaining attached to the surface of a polystyrene Petri dish after mechanical disruption by scraping. The upper, domed part of the cell has been removed, revealing the presence of a penetration pore in the basal cell wall attached to the substratum. The pore is surrounded by an annular wall thickening. Within the pore, the surface of the polystyrene has not been indented by the fungal penetration peg. The fragments are approximately 6–10 μm wide. Image courtesy Richard O'Connell, Max-Planck-Institute for Plant Breeding Research, Department of Plant–Microbe Interactions, Köln, Germany. See the paper by Kleeman et al. in this issue, pp. 1204–1217.