When a tree is to be felled, or a piece of virgin ground broken, or on many other occasions, permission is asked of the nuno, in order to avoid the misfortune that would come from angering it.
The nuno is described to be a small old man with a long beard, but differs from a dwende or dwarf of Philippine folklore.
Nuno sa punso are also believed to inhabit places such as underneath large rocks, trees, riverbanks, caves, or a backyard.
It is a common belief in the Philippines that if modern medicine is unable to cure a particular illness, the ailment may be due to a nuno's curse.
During this ritual, a burning piece of alum (tawas) or a candle is melted and poured onto a disc or spoon.
To avoid the wrath of a nuno sa Punso, children are reminded not to play outside between noon and three o'clock in the afternoon.