1. Hidden life: Bagliettoa baldensis lives inside limestone.
2. Tiny pits: Decaying fruiting bodies can leave hollows about 0.2 mm across.
3. Joining pits: Repeated generations may create connected shallow troughs.
4. Water: Persistent wetness and fungal decay may expose more stone to dissolution; living threads may also bind grains.
5. Field observation: Compare pale patches, black dots and empty pits with a hand lens.
