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Figs 3-5 - Variation in the sexual behaviour of natural Clones of Achnanthes longipes (Bacillariophyta)

Achnanthes longipes. Fig. 3. Abundant auxosporulation (arrows) following intercrossing between clones in mixed culture. Fig. 4. Chain of abnormal cells (a-f) produced after vegetative cell enlargement in clone 9. Several cells (especially a, b) are unusually elongate along the pervalvar axis and in some (c, d) the cell contents have degenerated ; in cell b the protoplast has contracted away from the frustule (arrow). Note that no stalk is present. Fig. 5. A chain of normal cells with its stalk (arrow). Scale bars represent : Fig. 3, 100 µm; Figs 4 and 5, 20 µm.
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