Whats this wierd thing?

Hi people, i'm in The Amazon jungle in Perú . In my garden, I can see that under certain trees, beneath the leaves, a white mass that smells like mushrooms.

Is this a mushroom? Whats this?

That might be something like this:

dog vomit slime mold. This slime mold is relatively common with a worldwide distribution, often being found on bark mulch in urban areas after heavy rain or excessive watering

https://en.wikipedia.org/wiki/Fuligo_septica

Note: see the picture labeled Dark-colored aethalium