Here is a partial list of items that appear to be in Renewed (show up in JEI) but appear not to generate in the world:
Crafting Tables (monuments):
Wood-elf - not found in Woodland Realm biome
Rivendell - no Rivendell biome, not found in Eriador biome
Cherry Tree - finally found some in The Shire, seems too rare?
Shire Pine - not found in The Shire
Green/Red-Oak - Mirkwood? not found