Areolae may be spaced such that they form striae, or rows, in three directions. Decussate areolae form a transapical striae and two opposing oblique rows of striae. Such patterns are found in the genera Decussata and Pleurosigma.
Image Credit: Pat Kociolek
The decussate striae of Decussata. Note that the areolae give the appearance of being organized into transpical and oblique rows.
Image Credit: David Burge
The striae of Pleurosigma are characteristically decussate.