Charophytes of Australia’s Northern Territory - I. Tribe Chareae Author Casanova, Michelle T. Author Karol, Kenneth G. text Australian Systematic Botany 2023 2023-03-30 36 1 38 79 http://dx.doi.org/10.1071/sb22023 journal article 10.1071/SB22023 1446-5701 10904227 Lychnothamnus (Rupr.) Leonh. , Lotos 13: 57, 72 (1863), p.p. Chara sect. Lychnothamnus Rupr., Beitr. Pflanzenk. Russ. Reiches 3: 11–12 (1845) . Type : Lychnothamnus barbatus (Meyen) Leonh. Monoecious. Plant axis corticated or cortex reduced to a few filaments growing down from the axial nodes. Stipulodes in one whorl (haplostephanous), branchlets ecorticate, bract cells elongate (> 8 mm ) and verticillate. Gametangia arranged on the branchlet nodes side-by-side, usually two antheridia with a central oosporangium. Gametangia originating from different initial cells. Helical cells of the oosporangium terminated by a coronula of five cells. Oospores with a calcified covering ( gyrogonite ). Lychnothamnus has one species in Europe, with representatives in China ( Han and Li 1994 ), India ( Wood and Imahori 1965 ), the United States ( Karol et al. 2017 ), and several fossil representatives ( Martin-Closas and Ramos 2005 ).