Buttercup and plastic-fed lichen

Another new record in the shape of a buttercup seedling, almost certainly creeping buttercup Ranunculus repens.

 

While peering at the box today, I noticed some lichen-like discoloration on the curved over edges of the box and, on close examination, concluded that it was indeed lichen that had become integrated (or immersed as I believe the lichenologists say) in the plastic.  The 'plant' was also only evident on the outer, sunlit surface of the plastic. 

I am consulting our county expert on these plants and will report back.