What is the description of the appearance of the spore-bearing fern?

Ferns are perennials mainly herbaceous, although tree-like forms, vines and epiphytes are found. The external structure of a herbaceous fern is represented by well-defined vegetative organs: an adventitious root and a rhizome, on which buds are formed. From the buds, a kind of leaves develop, which have a stem origin, they are called fronds. These are branched and flattened shoots, strongly resembling leaves. Young fronds are compactly twisted like snails, and gradually unfold as they grow. On the underside of the plates, sporangia are formed, where spores develop. Externally, sporangia look like a cluster of yellowish tubercles.