Very odd. Perhaps some type of fungal mycelium? Are the threads tough like roots or do they break easily. Is there any smell? When zooming-in, I think I can see that many of the threads are interconnected in a way which fungal mycelium strands often are (plant roots don't form connections this way.) However, the photos aren't quite in focus enough to zoom in very far.
A trowel in the hand is worth a thousand lost under a bush.
Top pic it the underside of a bit I pulled out. No smell. They are soft like matted roots and they lie close to the surface. Photo is zoomed so in reality the individual strands are much smaller It looks like it would be pretty easy to scrape away if it's something I'm better off without
It's quite close to my 'lawn' which does have some grass😉. It'll get hidden by foliage in a couple of months . Is it ok to leave it? Thanks for your help @BobTheGardener
I don't have any lawns, so not a lot of experience in dealiing with it, but the RHS says it is encouraged by low nitrogen levels, so I'd maybe a bit of manure would do the trick (ie raise the nitrate level significantly?) Well-rotted manure is my cure-all!
A trowel in the hand is worth a thousand lost under a bush.
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Top pic it the underside of a bit I pulled out.
No smell. They are soft like matted roots and they lie close to the surface. Photo is zoomed so in reality the individual strands are much smaller
It looks like it would be pretty easy to scrape away if it's something I'm better off without
Thanks for your help @BobTheGardener