Here, I want to present an interesting early-fruiting species that I only have (for now) macrophotographs because I saw this in a public garden and was not prepared for collection (also images from my mobile) but I am sure it is a Leucocoprinus. Usually these early-fruiting yellowish basidiocarps in artificial soil are L. birnbaumii but this one was different in:
1. Not in compost / peat or pot but more 'outdoor soil'
2. Smaller, thinner, "fragile" - the ring falling off
3. Colours are definitely paler
So then doing further research, I am thinking that I found Leucocoprinus fragilissimus. The only thing is that from many images this species on the net, it seems to have a narrower, tooth-pick like stipe (but some shows similar features).
I can do a collection tmrw, hoping they are not destroyed.
In the image below I slightly enhanced the colours