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Nostoc Commune
looks like the blue-green algae called Nostoc commune. There's a page on it here: http://www.dgsgardening.btinternet.co.uk... - it doesn't look very nice but seems to be harmless. Another link relating to the algae on grass: http://www.lsuagcenter.com/en/lawn_garde... - looks like it's down wet conditions so improving drainage might help.
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