Clearwater. 1 Navicula radiosa (6277) 2 Navicula rhynchocephala (6277) 3 Navicula cryptocephala [cf. N. cryptocephala PH] (6277) 4–8 Navicula trilatera (6280) 9 Pinnularia ignobilis [cf. Chamaepinnularia krookii PH] (6280) 10–12 Pinnularia brebissonii (6280) 13 Pinnularia lenticula [cf. P. lenticula PH] (6278) 14, 15 Pinnularia viridiformis (6280). Scale bar: 10 µm.