Sphaerotrichia firma (E.S.Gepp) A.D.Zinova
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)
Kim, S.-H, Peters, A.F. & Kawai, H. (2003). Taxonomic revision of Sphaerotrichia divaricata (Ectocarpales, Phaeophyceae), with a reappraisal of S. firma from the north-west Pacific. Phycologia 42(2): 183-192, 9 figs, 3 tables.