I have noticed similar gaps in the CERF list of Patristic sources. Irenaeus is almost completely ignored. The list of references in Clement of Alexandria are sloppy (but I haven't double checked the list against Stahlin). It was originally so hopeful to have found a definitive list of Patristic witnesses to the New Testament. Now I am quite disappointed. Someone has to go through this list and make it more exact.
UPDATE - Correction the Methodius fragment in Epiphanius is in fact listed in CERF but the rest of what I say here still stands.
Stephan Huller has had a life long interest in religion and spirituality 
dating back to conversations with his grandfather, Gaston Frank. "He said we represent one of the last descendants of the Frankist Jewish faith in the world," he muses. "I grew up thinking that our family was something like the Last of the Mohicans."