Microscopy, Electron, Scanning, Carbon Dioxide - metabolism, Snow, Volatile Organic Compounds - metabolism, Ericaceae - metabolism, Betula - physiology, Ericaceae - physiology, Hot Temperature, Betula - ultrastructure, Ericaceae - ultrastructure, Microscopy, Plant Leaves - metabolism, Arctic Regions, Plant Leaves - anatomy & histology, Ericaceae - anatomy &...