The moth genus Dryopteris is now considered a junior synonym of Oreta. Dryopteris , commonly called wood fern, male fern (referring in particular to Dryopteris filix-mas), or buckler fern, is a genus of about 250 species of ferns with distribution in the temperate Northern Hemisphere, with the highest species diversity in eastern Asia. Many of the species have stout, slowly creeping rootstocks that form a crown, with a vase-like ring of fronds. The sori are round, with a peltate indusium. The stipes have prominent scales. Hybridisation is a well-known phenomenon within this group, with many species formed by this method.