TY JOUR TI MORPHOLOGICAL VARIABILITY OF SPECIES OF THE GENUS ACHNANTHIDIUM (BACILLARIOPHYTA) RARE FOR THE FLORA OF RUSSIA KW Nizhny Tagil Reservoir KW phytoplankton KW Bacillariophyta KW Ashnanthidium KW electron microscopy KW morphological variability JO Transactions of Papanin Institute for Biology of Inland Waters RAS AU Genkal, S.I. AU Eremkina, T.V. PY 2022 IS 0 PB Papanin Institute for Biology of Inland Waters Russian Academy of Sciences