I suspect this is a Cladonia species, perhaps pixie cup. These have long fascinated me, such strange shapes. I’m glad I’m not an ant having to navigate among them.
Late afternoon became sunny and pleasant, not long after we finished a mint (Mentha spp.) transplantation exercise, establishing three new colonies, two to the south, and one (the large parent plant) to the southwest. The hillfort is now empty of foliage, although I’m certain many aggressive mint roots remain. I will transplant at least one rhubarb crown to the north margin of the hillfort. It’s time; they are languishing in the shade by the sour cherry.