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I'm sorry, too lazy to type a description. Here are some links to good descriptions. They also include habitat descriptions, but I think it's pretty obvious that it grows on (dead parts of) Poplar trees. I found it on a Poplar (Populus spec.) aswell. http://www.rogersmushrooms.com/gallery/D... http://www.first-nature.com/fungi/agrocy...
Here is a link about the nutritional value of the mushroom: http://slism.com/calorie/108036/