S_papillosa
Description: Siver, P.A., Kapustin, D. & Gusev, E. (2018): Investigations of two-celled colonies of Synura formerly described as Chrysodidymus with descriptions of two new species. European Journal of Phycology 53(3): 245-255.
Autecology: pH indifferent, prefers low conductivity.
Distribution: Widespread.