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Central Iowa mushroom

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I found these mushrooms on a standing tree near a river in Central Iowa today. I would like help identifying them determine edibility. 

8537B55E-7DF2-4A9D-A803-E326DF917D36.jpeg

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These look like a species of Pleurotus to me. Were they found growing on a hardwood or conifer tree? Pleurotus species grow on hardwood trees; Pleurocybella porrigens grows on coniferous wood. 

If you take a spore print, then collect it on two non-porous/non-absorbent surfaces, one white and one black. Pleurotus mushrooms come in different species; some  have white prints some --like the classic Oyster Mushroom, Pleurotus ostreatus-- have pale smoky gray/lilac prints. The deviation from white is best seen against a white background. 

 

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I’m in DSM as well, and those look identical to some oysters I found on an elm stump at my folks’. Check back every month for new growth, seemed to be about how often new mushrooms came back

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