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...
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