Pathogenicity and taxonomy of Hypoxylon mammatum

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Abstract
Typical cankers with stromata were produced when aspen were inoculated with isolates of Hypoxylon mammatum (H. pruinatum) from aspen, but isolates from alder and willow were incapable of producing typical cankers on aspen. Isolates from willow produced cankers initially, but these were eventually callused over. Isolates from alder and aspen were not able to incite cankers on alder. Dimensions of the perithecia and ascospores of the fungus on aspen are not sufficiently different from those on birch, willow, and alder to justify maintaining H. pruinatum as a species separate from H. mammatum.

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