I posted this on the "Post your citrus photos" forum but think this might be a better place...?
I found about 4 of these leaves on my otherwise healthy Meyer this morning... I did a search on this forum and nothing turned up... I hope it's just nothing, I've spent two years bringing this tree back from "the edge"... The leaves mainly seem to be out of a node below a successful navel bark graft (from my sisters tree).