While browsing at Kinokuniya, I found the Singapore Science Center published "Guide to tropical fungi". This field guide is a nice to have especially with the rainy season, and fungi are springing up everywhere.
I'm just happy to have something to refer to and put a name to the fungi I spot such as these ink cap mushrooms that had been nameless for a very long time.
Ink caps assist in the decomposition of wood, dung, grassy debris, forest litter, and so on. It answers my question on why I always find them on mulch piles in the parks.
As the mushroom matures the gills under the caps produce black spores as a result these mushrooms got their common name "ink cap". The next time you walk in one of our parks and the contractor has placed piles of fresh mulch have a look to see if ink caps start to sprout.