Poria similis Bres.
J.E.Wright (1964) Oxyporus similis is a species of fungus in the Schizoporaceae family.
A plant pathogen, it is found in the Pacific Northwest region of the United States, where it grows on the trunks of black cottonwood (Populus trichocarpa).
[1] It also affects peach and nectarines.
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