Bumping this because I came across some wonderful fresh silver ear fungus in a supermarket today.
I'm glad to see that the locals are as confused as everyone else by the nomenclature. The typed information gives (correctly) the name as 银耳 (yín ěr) or "silver ear". The hand written sign incorrectly calls them 云耳 (yún ěr) or "cloud ear" which are unrelated and a different colour. See above.
It is about 15cm/ 6 inches in diameter and weighs 190 grams / 6.7 ounces.
I'll be having this later in a soup, I think.
(4.50元/朵 = USD $0.67; €0.61; £0.51/head)