This grower is sure of this plant identification.
Stays lime green and very upright. OK in early or late sun (haven't tried it in full sun, but Dryopteris usually pretty drought resistant). Very special, so would need to swap for something equally rare!
Buckler fern, Wood fern, Shield fern, Fern
Dryopteris genus (Buckler fern). This genus consists of about 200 species of deciduous or semi- evergreen terrestrial ferns. They are found mainly in woodland settings by streams and lakes.
They are fully to half hardy and will require shade and moist soil. Regularly remove fading fronds.
Some types form interesting, shuttle-cock like crowns.