Very interesting, tell us about the spore print...
I think a lot of tropical mushrooms have gone un identified so far, but without a spore print I'd say its in the group strophariaceae. That's a wide guess, but If it was growing on or near dung It could be paneolus or psilocybe. Look for a purple-black spore print. Any chance that black staining was a bit bluish? Was it growing in a group or solitary?
If the spore print is brown it might be a pholiota.
Hope that helps, post more pictures...
The devil haunts a hungry man - Waylon Jennings
Let me tell you a story about a man named Jed. He made this tiny ad:
Switching from electric heat to a rocket mass heater reduces your carbon footprint as much as parking 7 cars