And one more idea, although I won't bet that it's new, maybe it was discussed even above in the thread, I don't remember.
Supposing that marginalia may refer to the contents of a folio, ceteris paribus I would prefer "lux" as the base word form behind the "lucz", just because the plant mnemonically features eyes, and one of the meanings of "lux" is "eyesight".
EDIT: Yes, actually Marco wrote about this a year ago in this very thread. I think it's worth keeping this in mind: "lux" as the foremost option.
Supposing that marginalia may refer to the contents of a folio, ceteris paribus I would prefer "lux" as the base word form behind the "lucz", just because the plant mnemonically features eyes, and one of the meanings of "lux" is "eyesight".
EDIT: Yes, actually Marco wrote about this a year ago in this very thread. I think it's worth keeping this in mind: "lux" as the foremost option.