I found lots of these yellow mushrooms in Ellie's field recently & wondered what they were, I was also concerned they may be poisionous. I took some pics & tried to ID it thorugh Google: no chance!
So I found an excellent web-site whose author welcomed enquries. He came straight back to me - these are Yellow Fieldcaps -edible but apparently not tasty. Neither I nor Ellie have sampled them.
Here's the best bit - he asked that my picture is included on his web-site. It's now there credited to me. More info (with my pic included) http://www.mushroomdiary.co.uk/…/yellow-fieldcap-mushroom-…/