Forget the fungus for the moment, what about those little 'tracks' any ideas, perhaps snail radula marks?
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The snail mark theory sounds entirely plausible to me. But there might be more (or at least better informed) responses from the Invertebrates group. Are the fungi Daldinia concentrica?
There is a beetle that feeds on this fungi called Platyrhinus resinosus,so maybe that.
Ah, the wonderful chain of life! I wonder what eats those resinous flat-nosed little delicacies?
I looked at other grazing tracks and also took note that slugs and snails do eat fungi. There may be something in those black fungi that snails do not eat that is not contained in the spores. It does not look like they have eaten any of the fungus itself.
They also take alga from wood as can be seen here.
Lat/Lng: 51.958194722222, -0.63822722222222
OS grid ref: SP936297