Materials to the Zygnemaceae of Poland. IV. Spirogyra australica Czurda - a species new in Poland

Spirogyra australica Czurda 1932 was identified in a sample taken from a small pond in the Arboretum in Rogowo (Skierniewice Voivodship) on June 17, 1986. The diagnosis of this species has been supplemented with data on the width of vegetative cells, the dimensions of zygotes and the development of the conjugation tube. S. australica has been reported in Europe only in the Federal Republic of Germany (Bock and Bock 1956, Arch. Hydrobiol. 52). The figures presented in this report are the first graphic documentation of this species.