German botanist (1867–1915).
Ernst Johann Lemmermann (27 May 1867 in Bremen – 11 May 1915 in Bremen) was a German botanist who specialized in the field of phycology. During his career he taught classes (Seminarlehrer) in Bremen, where he also worked as a botanical assistant at the Städtisches Museum für Natur-, Völker- und Handelskunde. In Bremen he was an instructor to biologist Friedrich Hustedt (1886-1968), who named the diatom species of Achnanthes lemmermannii in honor of his former teacher in 1933. He was also honoured in 1942, in Lemmermanniella, which is a genus of cyanobacteria belonging to the family Synechococ