Creeping Buttercup (Ranunculus repens)

Creeping Buttercup (Ranunculus repens)

Observation - Creeping Buttercup (Ranunculus repens) - UK and Ireland. Description: Can anyone suggest what is causing the black marks on these buttercup leaves? I came across a couple of patches like this, both at the edge of a freshwater loch.

Can anyone suggest what is causing the black marks on these buttercup leaves? I came across a couple of patches like this, both at the edge of a freshwater loch.