Black/green mould on earth, ID help appreciated!

Hello - hoping some of the many knowledgeable gardeners on here may be able to help. On a patch of compacted earth in front of the garden gate and next to one of our raised beds there has recently appeared a couple of patches of what looks like black and green mould/lichen. The proximity to veg patch obviously slightly worrying, does this look familiar to anyone/any advice? All I can see online is a suggestion to aerate but that doesn't strike me as likely to solve the problem...

Pics




thank you!

 

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Looks more like some dried up puddle muck/algae, have a very close look at it, shouldn't do any harm

 

Thank you!

Hmm, there has never been a puddle there so not sure that quite explains it. Definitely looks like some sort of bloom/mould? The green one is just fairly common algae I think, not so worried about that, but slightly uncomfortable with the black one spreading around close to the veg patch... don't suppose anyone has seen anything similar?

 

Just break the surface up with a hoe and it will probably disappear.

 

since the ground is heavily compacted, that promotes stagnating water (originating the dark patch) so you have two solution: one more labour intensive but lasting, one easier but not lasting.