Very good, JF. I'll look for the GN this year. Btw, Clementine is the marketing name for Algerian. I guess you have an Algerian tree?
I wonder how Sumo compares to Ponkan, which is its parent or a somewhat close relative.
Like Sumo(deskopon) and Cuties, Ponkan is not an actual cultivar but a category for what a good mandarin should be. Sumo has very loose pockmarked skin, sweet, with a conspicuous bump on top. Cuties are flat shaped, small sized, smooth skin, sweet. Ponkan in China means very loose pockmarked skin, medium sized, is sweet. In CCPP collection in UC Riverside, Ponkan is a "variety" they imported, . Hopefully it produces fruit of similar quality.