Abstract
Two new species of Nitella found in Australia are described as Nitella ignescens sp. nov. and N. ungula sp. nov. Both are small dioecious plants possessing bicellular dactyls. They are unique among all previously known charophytes in that N. ignescens is quite small in stature relative to its large antheridia, and N. ungula has a very long and acute end cell in the dactyls. In addition, the oospore ornamentation in each species is very distinctive under scanning electron microscopy, being reticulate without flanges in N. ignescens and vermiferous with well-developed flanges at the apex and base in N. ungula. Nitella ignescens was found on the shoreline of Lake George, New South Wales, in subsaline waters a few centimeters deep. Nitella ungula was found in Lake Bathurst, New South Wales, and Lake Muirhead, Victoria, in subsaline waters at depths of a few centimeters to 1.0 m.
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