Huthu is a planet in the Ekumen. Its primary biome is presumably rainforest. It is referred to as having "tree-cities", so its inhabitants are presumably arboreal. On Huthu there is a system of what may be communication called "brachiation" which seems to be an alternative to writing. There is also some sort of native blue skin fungus on the planet.This forum neeedd shaking up and you've just done that. Great post!
Leaf worked for four years on Huthu before transferring to Eleven-Soro, and Serenity and In Joy Born spent that time with her there. Because of this, it is probably located close to Eleven-Soro.