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

Figs 3-5. 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.
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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