Oyster mushrooms (P. ostreatus) are really incredible for this sort of application. They can be trained to breakdown different things including cigarette butts. https://www.youtube.com/watch?v=fCAX9P50SNU

edit: If anyone really wants to learn more about environmental remediation using fungi, the guy in the video above has a 600 page book that was written for that purpose called 'Radical Mycology' Personally I find it a bit on the hippy side in some areas and I get tired of all the evolutionist bs. But there is lots of good information in it too.

Oyster mushrooms (P. ostreatus) are really incredible for this sort of application. They can be trained to breakdown different things including cigarette butts. https://www.youtube.com/watch?v=fCAX9P50SNU