In article ,
Emrys Davies wrote:

It looks like a fat toadstool without a stem. Its centre is slightly spongy
and grey-black in colour. Just wondered what it is and how to kill it.

It could be any one of hundreds, and it makes no difference. You
won't be able to kill it. One of the reasons that roads etc.
need to be very thick is to discourage such fungi.


Regards,
Nick Maclaren.