Many thanks gully.moy for your interesting comment. You are completely right, maybe Coprinellus sp. is a sensible choice for the identification. Microscopy has the answer but ...
Coprinus plicatilis has been moved to the genus Parasola to reflect advances in our understanding of how fungi are related. Although your mushroom does resemble P. plicatilis, the universal veil remnants on the cap (little white dots) give it away as not Parasola.
As Michael Kuo (of MushroomExpert.com) puts it, there are "a gazillion little coprinoid mushrooms [that] look like Parasola plicatilis, so a microscope is needed for successful identification".
It is a Coprinellus/Coprinopsis at least, probably the former.
http://www.mushroomexpert.com/parasola_plicatilis.html
http://www.mushroomexpert.com/coprinoid.html
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