Brain Puffball (Calvatia craniiformis, 头状秃马勃). Another calvatia growing on Yuelu Mountain(嶽麓山) during this hot and humid season. I don't see them on the lower slopes but at higher elevations these ostentatious wrinkled skulls seem to be everywhere. This one shows burrowing holes made by small beetles, which frequently make them a summer residence, before they crumble into spores and dust.
