I HATE HATE HATE common names!
In my head I pronounce things not always the same as if I were to speak them. In my head, phylla will always be filla, but of course I would pronounce it properly if I were to speak it. I always say the word EX in my head when I see a hybrid.
I do not pronounce leuco as "luke-o". I say it as "lieuco" as in "in lieu". Fortunately it's a "dead" language so we get some freedom with the pronunciation. I was pleased when I saw that video with Rob Cantley. I was very happy to hear him speak, because I discovered then that I had been pronouncing everything properly all along. He did say "cross" instead of "ex", but other than that I say the same things.