you could have another lepidella here; more of that odd upright appendiculate cap margin, and stipe flocculence; the white color fits, too…beyond that…tough to get much closer to a name w/out the specimen in hand, and even then…
looks like you disturbed an ant’s nest and they were doing a bit of defensive spraying; don’t know that it was necessarily related in any sort of symbiotic way to that lone amanita tho…prob. more a coincidence of growth location.