The whiteish ones are Stereum Ostrea - not edible, but the Jew's Ear (Auricularia Auricula-Judae) is and has medicinal properties (blood thinner).
Here are the links to both mushrooms:
http://en.wikipedia.org/wiki/Stereum_ostrea
http://en.wikipedia.org/wiki/Auricularia_auricula-judae
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