Wpływ suszy na komórki niektórych gatunków desmidii

Abstract

In July 1982 desmids cells enclosed in mucilaginous sheaths were recorded during drought in the Bagno Przerębiec transitional peatbog. They were the specimens of Cosmarium contraetum Kirch., Cosmoastrum punctulatum (Breb.) Pal.-Mordv. var. kjellmanii (Wille) Pal.-Mordv., Desmidium cylindricum Grev., Desmidium swartzii (Ag.) Ag. ex Ralfs and Raphidiastrum avicola (Breb.) Pal.-Mordv. Besides, in certain cells a change in the colour of chloroform from dark green to olive or yellow-green and numerous oleaginous granules were observed. It may be presumed that the cells of the above mentioned algae are capable of surviving drought due to their ability to produce mucilaginous sheaths and areolas, which protect them from drying.