FIGURES 33–38. H in Seven new species expand the morphological spectrum of Haslea. A comparison with Gyrosigma and Pleurosigma (Bacillariophyta)

FIGURES 33–38. H.tsukamotoi sp. nov. SEM, isotypes. Fig. 33. Large specimen, general aspect, interior view, bar = 5 μm. Fig. 34. Average specimen, general aspect, exterior view, bar = 10 μm. Fig. 35. Centre, interior, bar = 2 μm. Inset (2x enlargement): note sideways tilted central raphe node. Fig. 36. Centre, exterior, bar = 2 μm. Inset (2x enlargement): detail of crook-shaped raphe endings. Fig. 37. Apex, interior, bar = 2 μm. Note apical pore (arrow). Fig. 38. Apex, exterior, bar = 2 μm. Note apical pore (arrow).