The Dryopteris affinis aggregate includes D. affinis s.s., Dryopteris borreri and Dryopteris cambrensis.
Shotover (VC23: Oxfordshire); 2014-12-11
The dark patches at the base of each pinna are characteristic for the aggregate; within that group, Dryopteris affinis lacks the truncate pinnule-tips of Dryopteris borreri and the long, acute pinnule teeth of Dryopteris cambrensis.
Shotover (VC23: Oxfordshire); 2014-02-18
All images copyright © Christopher J. Dixon unless otherwise indicated.