Q.Lawn Fungus And How To Treat It
I have had this fungus growing in my garden for up to a year and have sprayed the fungus once a week with bicarbonate of soda for at least 6 applications and it isn’t getting any better.
Certified GKH Gardening Expert
You have to rake those up or mow them, then pick up the pieces and discard in trash. There must be fungi below ground on some decaying wood of some kind. These are their fruiting bodies. The soda will not help. You will have it till the dead wood or roots below ground are completely decomposed.
https://www.gardeningknowhow.com/ornamental/fungus-lichen/environmental-benefits-of-fungi.htm
https://www.gardeningknowhow.com/ornamental/fungus-lichen/mushroom-identification.htm