1 Nitzschia lacuum (6956) 2–7 Nitzschia fonticola (6957) 8 Nitzschia perminuta (6957) 9–11 Nitzschia alpina (6957) 12 Nitzschia inconspicua (6957) 13 Nitzschia pusilla (6956) 14 Nitzschia pura (6956) 15 Nitzschia palea (6955) 16–19 Nitzschia homburgiensis (6957) 20 Nitzschia dissipata (6957) 21Nitzschia dissipata var. oligotraphenta (6958) 22 Nitzschia linearis (6957) 23, 24 Nitzschia sublinearis (6956, 6957) 25 Nitzschia exilis (6955) 26–28 Nitzschia amphibia (6955) 29, 30 Nitzschia angustata (6957) 31–33 Denticula kuetzingii (6955, 6957) 34, 35 Denticula tenuis (6957). Scale bar: 10 µm.