Odd...its ancestor doesn't specify why its antifreeze-producing cells are red, so it's unclear whether you yourself ought to elaborate on that.
The description feels very small. Can you add to it?
It says "Sexual (Airborne Spores)', but how many mating types does it have? A single mating type, perhaps? Sexual spore production on Sagan 4, unfortunately, rarely goes into detail except at the macro level. Weirdly enough, the first Melanophyta (black flora) species to develop sexual reproduction have left no living descendants, so sexually-reproducing Melanophyta aren't descended from it, and descendants of the Polar Sunstalk alone have independently developed sexual reproduction at least three times. (Greysnip, Bonespire, Salty Sunstalk)