Closterium cornu Ehrenb. ex Ralfs var. lundellii (Lagerh.) Willi Krieg. 1935 (Desmidiaceae) — eine Taxon-Revision.

Abstract: The uncertain systematic placing of the desmid taxon Closterium cornu var. lundellii (nomenclature in modern identification books) is discussed by evaluation of the morphological data of a zygospore-forming population in comparison with vegetative cells of two populations of Cl. cornu and a zygospore-forming population of Cl. gracile. The distinctive features of vegetative cells and zygospores give evidence for independent species status of the discussed taxon, not for that of variety of the species Cl. cornu or Cl. gracile. Therefore return to classification Closterium lundellii Lagerh. 1883 is required. Further, the first detailed description of Closterium lundellii, both vegetative cells and zygospores, is given, illustrated and proved by drawings and scanned microphotographs. [Copyright &y& Elsevier]