Yellow slime? on grass

[Laggard]

What is this please?

 

[Treg]

What is this please?

I've got the same thing & was thinking of posting on here to ask the same question, so will be interested in replies.
It's quite a bright yellow when fresh first thing in the morning, don't see any fresh through the day.

 

[Laggard]

Quite a few patches of it, not only on the grass but weeds as well.

 

[Old Boar]

Dog vomit fungus or yellow slime mould. Rake it over and sprinkle baking powder over the area to kill it.