Hard to tell with specimen of such advance age, I guess, but that could be it. It is possible that more will come up.
That is either Chlorophyllum rachodes or C molybdites. http://www.mushroomexpert.com/chlorophyllum_rhacodes.html http://www.mushroomexpert.com/chlorophyllum_molybdites.html
Ahhh, 'The Vomitter'! It is really hard to get a spore print on these, they have to be very fresh and not too young or too mature.