Many of the plants in this part of the garden were originally put in when this was a shady space. Amazingly enough, some of them have continued to do well even though they are now in almost full sun most of the day. Case in point are the two ferns by the log in this photo. You can tell from the plants around them — Calamintha, Monarda and Sumac — that this spot gets lots of light.
But Adiantum venustum (Himalayan maidenhair fern all around the log's right end) and Athyrium felix-femina 'Frizelliae' (Tatting fern behind the Adiantum) are both holding their own in this bright spot. My guess is the great soil and pretty consistent moisture that typifies this area, lets them deal with more sun without fading away.