Description:
<jats:p>In samples collected in Norway the following species new for Europe, <em>Mougeotia olivacea</em> Y.J. Ling,<em> Mougeotia mysorensis</em> Iyengar, <em>Spirogyra reflexa</em> Transeau and <em>Spirogyra schmidtii</em> W. et G.S. West, are identified. The diagnosis of <em>M. olivacea</em> has been supplemented with data on the dimensions of vegetative cells and zygotes and the number of pyrenoids. The diagnosis of <em>M. mysorensis</em> has been supplemented with data on the number and distribution of pyrenoids and, often curved, vegetative filaments. The sites of <em>M. olivaceas</em> and <em>M. mysorensi</em>'s occurrence are the second one in the world. Morphological features and dimensions of <em>S. reflexa</em> and <em>S. schmidtii</em> are congruent with those given from other non-European sites.</jats:p>