TY JOUR TI THE ASSESSMENT OF THELICHEN FREQUENCY AND COVERAGE ON THE LARCH IN THE VALLEY LIGHT FORESTS AND FORESTS OF THE WEST-SIBERIAN PLAIN KW species frequency KW coverage KW lichen KW West Siberian plain JO Bulletin of KSAU AU Ryabitseva, N.Y. PY 2015 IS PB Krasnoyarsk State Agrarian University