Twenty two species of silkweeds (Zygnemataceae), two species of Mougeotia, Sirogonium sticticum, thirteen species of Spirogyra and five of Zygnema were encountered in recent collections of macroalgae from the Upper Murrumbidgee River catchment in the Southern Tablelands of New South Wales and the Australian Capital Territory, Australia. The majority of the taxa collected were newly reported for Australia. The occurrence and distribution of silkweeds in both flowing water and wetlands in the catchment is similar to that described for other semi-arid parts of the world, notably Spain, south-western United States and the coastal areas of the Netherlands.
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