Lawn problem

Anyone put a name to this 'fungus growth in our neighbour's lawn?

Not easy to see but the dark part of it looks like a piece of black PVC.

 

Hello @Palustris

According to a Visual Search it could be:

Peltigera rufescens (Little dog lichen / Klein leermos

Kevin

 

Thank-you, that does look like it. No idea where it has come from, it has not been there before. He is usually well up on lawn problems as a greens keeper for the Bowling Green in town.