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Nectria perithecia and Tubercularia conidia of Coral Spot Disease

Nectria cinnabarina is a weak parasite of hardwood twigs and branches, often attacking through wounds. Early in the year, it produces coral-coloured spots (right) that bleach with age and weathering. This is the conidial (asexual) state of the fungus (= Tubercularia) and is produced on a cushion-shaped (erumpent) stroma called a sporodochium. Later in the year, clusters of dark orange perithecia form on the SAME stromata as the conidia.

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  Left: perithecia of Nectria develop on old stroma of  Tubercularia state.             Right:   erumpent stroma of the Tubercularia asexual (conidial) state.