A crossing pattern of striae. The striae may cross in three directions with a transapical row and two oblique rows. The genera Decussata and Pleurosigma have decussate striae.

Decussata 004 Copy
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.