Fig. 1. An American chestnut stem with a chestnut blight canker (Castanea dentata with a Cryphonectria parasitica canker). The fungus enters through wounds such as the broken branch stub on the left, and grows in and under the bark, killing the cambium. Fungal stromata break through the lenticels and pycnidia producing conidia and perithecia producing ascospores are formed. Photo by R. A. Jaynes.

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