Where does “macular” come from?

I need to work through this etymology chain carefully. The chain given is: English macular ← Latin -arius ← Latin -alis ← Latin -arius ← Proto-Indo-European -yós However, this appears to be a chain of suffixes rather than the etymology of "macular" itself. The headword is "macular" (meaning relating to or resembling a macula/spot), which comes from Latin "macularis" or similar, which is built from Latin "macula" (spot/stain) + the suffix "-aris/-aris." The chain provided seems incomplete or malformed for deriving "macular" - it shows suffix evolution but not the base word. Given the constraint to "state only what the chain supports" and not invent intermediate steps, I should work with what's explicitly provided, though it's problematic. The most accurate approach given these constraints:

macular (English): Relating to the macula, the area of the retina...