The word “ceterach” refers to a type of fern belonging to the genus *Ceterach*, specifically known as *Ceterach officinarum*, commonly known as the rustyback fern. This fern is characterized by its leathery, dark green leaves and a distinctive rusty-brown covering on the underside of the fronds, which consists of clustered spore cases. It’s often found in rocky or shaded areas across Europe and is of interest in both horticulture and herbal medicine.
