Pediastrum species (Hydrodictyaceae, Sphaeropleales) in phytoplankton of Sumin Lake (Łęczna-Włodawa Lakeland)

Abstract

During studies of phytoplankton in Sumin Lake (Łęczna-Włodawa Lakeland), conducted from May till September 2001 and 2002, 15 taxa of the genus <em>Pediastrum </em>(Hydrodictyaceae, Sphaeropleales) were found. Among them there were common species as <em>Pediastrum boryanum</em>, <em>P. duplex</em>, <em>P. tetras </em>and <em>P. simplex</em>, but also rare species as <em>P. integrum </em>or <em>P. kawraiskyi</em>. An especially interesting species was <em>P. orientale</em>, the taxon that until now has not been noted in phytoplankton of Polish water bodies. The paper gives descriptions of the genus <em>Pediastrum </em>coenobia and physico-chemical conditions of the habitat. The original documentation of <em>Pediastrum </em>taxa is added.