1–4 Lindavia antiqua (6957) 5–8 Diatoma tenuis? [D. moniliformis?] (6958) 9, 10 Meridion circulare (6956) 11 Diatoma vulgaris (6955) 12–15 Odontidium mesodon (6957) 16–21 Odontidium hyemale (6957). Scale bar: 10 µm.