Pearl Oyster almost fully eaten a totally dirty grease rag from a bike shop. Most bike lubes are made from teflon, which is “polytetrafluoroethylene” – and essentially carbon-based. This Oyster mushroom is shown on Day 4- Today, less than one week later, it has completely consumed the cloth rag soaked in a teflon-based lube!
This was inspired by Ja Schindler of Fungi for the People. Ja used to work at a bike shop and broke down their greasy rags with fungi. He told us about this at one of his amazing “Mushroom Cultivation” courses: http://fungiforthepeople.org/upcoming-workshops/
D.I.Y. Fungi 
This is awesome! Every bike, automotive, and engineering shop should have a mycocycling bin to toss rags and wipes into.