PLATE 20 in A diatom voucher flora from selected southeast rivers (USA)

PLATE 20. Light micrographs of asymmetric biraphid taxa. Figs 1–3. Gomphonema affine var. rhombicum. Figs 4–5. Gomphonema sp.9 SESQA. Figs 6–8. Gomphonema sp.35 SESQA. Fig. 9. G. acuminatum. Figs 10–11. G. coronatum. Figs 12–13. G. turgidum. Figs 14–15. G. truncatum. Fig. 16. G. turris. Figs 17–18. Gomphonema sp.11 SESQA. Figs 19–21. G. celatum. Figs 22–24. G. affine. Figs 25–26. Gomphonema sp.20 SESQA. Scale bars: 10 μm.