Reticulate and parallel venation are characteristic of dicotyledons and monocotyledons respectively.

Explanation:

The arrangement of veins and the veinlets in the lamina of leaf is termed as venation.

When the veinlets form a network, the venation is termed as reticulate. It is found in dicots.

When the veins run parallel to each other within a lamina, the venation is termed as parallel. It is found in monocots.