Confidence: I'm as sure as I can be.
Notes: Wrong habitat for Cladonia humilis, which is a ruderal species on bare soil, commonly in gardens, and which has a sheet of large, persistent, well-developed basal squamules. The photograph shows reasonably typical C. chlorophaea in a typical habitat. [C. chlorophaea is actually an aggregate of species or subspecies, but without chemical tests and examination with UV light, it isn't possible to say which one of the aggregate this is - though it has the appearance of true C. chlorophaea.]