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RE: The Amateur Mycologist - Random Find - Beautiful Coprinoid Species - Likely Coprinellus disseminatus
That's not inconceivable, if the siding was untreated and there was a serious moisture problem. Generally any mushroom you find growing inside or on the materials of a structure imply a serious humidity issue.
Oh yeah it was a serious moisture issue. I do roofing repair and service work and this customer thought they had a roof leak but it was a siding leak so the OSB under the siding was getting wet and staying that way for long periods. I see fungus all the time but this was the first time there was a mushroom.