The uppermost edges often fold back to form convoluted brackets:
The upper surface of the brackets are somewhat banded:
The undersides of the brackets are smooth with no visible pores:
This agrees well with the sizes of around 5-8 x 2.5-3.5um given in the descriptions listed on the species page at Mycobank.
First 2 photos and sample taken in Whiteknights Park, Reading, UK, on 2013-01-09.