Baillie-Back. 1 Hantzschia elongata or H. vivacior (6856) 2 Stenopterobia anceps (6860) 3 Surirella linearis (6858) 4 Nitzschia gracilis (6862) 5Nitzschia palea var. tenuirostris [N. palea var. tenuirostris sensu lato PH] (6857) 6 Nitzschia acidoclinata (6856) 7, 8 Nitzschia perminuta (6856, 6865) 9 Nitzschia alpina (6858) 10–12 UFOs (unidentified floating objects; desmids? Closterium?) (6860). Scale bar: 10 µm.