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This study of Northern Territory charophytes deals with the tribe Nitelleae in family Characeae. We recognise 16 species of Nitella for the Territory. The list includes seven previously described species (Nitella belangeri , N. biformis , N. congesta , N. heterophylla , N. micklei , N. myriotricha and N. tumulosa , of which N. belangeri and N. tumulosa are newly recorded for the Australian flora), and nine newly described species (N. acanthospora , N. boreali-australis , N. crocodylus , N. limosa , N. martinii, N. nitida , N. oollooensis , N. silicea and N. townsendii). Of the five previously reported Nitella species in the Northern Territory (N. hyalina , N. myriotricha , N. penicillata , N. pseudoflabellata and N. subtilissima), only N. myriotricha is recorded in this study, because the other records were based on erroneous identifications or localities. All Nitella species described here can be distinguished on the basis of their morphology and reproductive arrangement. Keys, illustrations and descriptions of all the species are provided. Macroalgae in family Characeae occur in inland waters throughout Australia. Species of Nitella (Tribe Nitelleae) that occur in Australia's Northern Territory have been reviewed, revised and described here, resulting in 16 species for the region. [ABSTRACT FROM AUTHOR]

This study of Northern Territory charophytes documents 22 species in 3 of the genera in tribe Chareae, family Characeae, including 15 previously described species (Chara benthamii , C. erythrogyna , C. globularis , C. karolii , C. lucida , C. porteri , C. protocharoides , C. setosa , C. submollusca , C. wightii , C. zeylanica , Lamprothamnium capitatum , L. compactum , L. stipitatum , Lychnothamnus barbatus) of which 2 are new for the Australian flora (C. erythrogyna and C. wightii), as well as 5 varieties raised to species rank (C. aridicola , C. arnhemensis , C. bancroftii , C. behriana , C. duriuscula), and 2 newly described species (C. lamprothamniformis , C. schultae). Three previously reported species in the tribe (C. braunii , C. corallina , C. fibrosa) are not recorded from the Northern Territory in this study, as previous records were based on erroneous identifications or localities. Although Northern Territory specimens of Lychnothamnus barbatus have not been seen, it has been included in this treatment, because it occurs in south-eastern Queensland, the Gulf of Carpentaria, Papua New Guinea and Timor-Leste. A key, illustrations and descriptions of all the species are provided. Macroalgae in family Characeae occur in inland waters throughout Australia. Species of Chara , Lamprothamnium and Lychnothamnus (tribe Chareae) that occur in Australia's Northern Territory have been reviewed, revised and described here, resulting in 22 species for the region. [ABSTRACT FROM AUTHOR]