Staghorns are native to jungles in Africa, Madagascar, Australia, Tropical Asia and one species is from South America. Not all species are from the jungle. P. veitchii grows on rocks in semi-desert Australia. They get their nutrition substantially from the air. Stags are therefore in the same class as orchids, for example, which also mostly grow in trees with no soil.
Stags have no flowers.
Don't think your stag is sick or has a disease when you see brown fuzzy patches appear on the bottom side of the tips of older larger fertile fronds. These are the spores . If you are given a staghorn fern or buy one, it is probably mounted on a wooden board. However, some people like to hang staghorn ferns from chains under large trees to form a ball of foliage . The mounting board you select should be a hard wood, like oak or mahogany, and as large and thick as you like.