Natural History Question - What is this?

[Psamathe]

Found a couple of strange patches on the grass this morning. Close together so I assume they are related. And I have nothing beyond wild guesses about what it/they are. Anybody any ideas?
(It's not a trick question and I'm not going to give an answer later 'cos I have no real idea myself)

Ian

[pete75]

It's powdery mildew - basically a type of fungus. Is it more prevalent in shaded areas of the lawn?

[Psamathe]

Is that both patches? The 2nd non-coating patch (not so white to the right in the top picture) does not look fungus like.

I'd wondered about powdery mildew but all the photos on the internet show a much thinner coating. This stuff is quite thick.

Ian

[PDQ Mobile]

Abominable Snowman footprints?

[thirdcrank]

Have you been treating your lawn with statins?

viewtopic.php?p=1181689#p1181689

[Mick F]

I haven't been sitting on the grass!

[mercalia]

Midget Aliens spaceship has landed and taken off, decided not worth the bother there

[Zoidsberg]

Calcified dog urine?