The purpose of this second edition of The Code Decoded is to serve as a user’s guide to the International Code of Nomenclature for algae, fungi, and plants (“Code”), specifically the Shenzhen Code (Turland & al., 2018). My objective, as for the first edition (Turland, 2013), has been to create a text that is reasonably clear and simple, which inevitably means it will fail to cover every r…