Similarly odd but perhaps in the other direction, I appreciate the Chlorophyta for pushing the bounds of a single cell. E.g., Valonia ventricosa 5 cm cells, or

Similarly odd but perhaps in the other direction, I appreciate the Chlorophyta for pushing the bounds of a single cell. E.g., Valonia ventricosa 5 cm cells, or the Bryopsidales genera like Codium or Caulerpa with large, articulating macroalgae plants that are somehow also single, multinucleated cells. You've even got Halimeda in there that is a single cell plant with a calcium carbonate skeleton.