Trichodesmium - pretty good tbh, but could use some clarification/more accurate descriptions in some places and expanding! Pretty important article!
Rework diatom morphology section (also get to GA status if chloroplast rework goes well)
Patrick Kociolek - BLP; phycologist and primarily a diatom taxonomist. I have pretty substantial WP:COI, so if I do write this article, it'll be quite a while down the road.
Watermelon snow and Snow algae - are these the same really? Will need to dig into and maybe expand more. Discussion in 2018 also suggested merge, but I do think there's a solid argument for separate pages.
chromatophore (endosymbiotic organelle) - not to be confused with chromatophore—pigmented cells in some animals—or chromatophore—the membrane associated vesicle in some bacteria. (This may just be a part of reworking the Chloroplast article, hence no red link)
Ellwood Cooper [Wikidata] - deceased, American horticulturist/businessman - shocked he doesn't have a page yet. He's credited with bringing eucalyptus trees to California
^Possibly restricted to non-pathogens and possibly host-beneficial. This is a hard line to draw and one day I'll publish a full on opinion/review in a peer-reviewed journal. Just give me 5-10 business years.
^Highly simplified language for brevity. As always, this is sort of like saying "humans evolved from monkeys" (or my preferred way of saying this incorrectly, "monkeys evolved from humans")