"Emrys Davies" wrote in
:

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.


One fungus that regularly grows through asphalt is Agaricus bitorquis.
That looks pretty much like a bog-standard mushroom that you buy in
greengrocers. (That doesn't really match your description very well)

If, and only if, it is A. bitorquis, then eat it and be grateful. If you
have any doubt about its species, then don't eat it - there are similar
looking fungi that will give you a bad stomach ache or much much worse.