I took pictures of my H. macrophylla. I think this is the Lace Cap. Anyone out there know?
Which hydrangea?
Definitely looks like a Lace Cap variety to me. Now, regarding the specific species of Lace Cap, I would contact Wilkerson's Garden in Georgia. They are one of the leading Hydrangea Nurseries in the Southeast.
Good Luck! If you find out the species, please let us know.