Reticulate venation is a type of venation, which is the arrangement of veins and veinlets on a leafs lamina. Reticulate venation is characterized by veins and veinlets that are unevenly dispersed throughout the whole lamina in certain leaves, producing a network. Veins are joined in this way to produce a web-like network. It may be seen in the leaves of rose bushes, tulsi, and maple trees, and is one of the most prevalent vein forms in leaves.

In contrast, parallel venation is when the formation of veins is parallel to each other through the leaf. It starts from the base and extends till the tips. For example, banana leaves have parallel venation.

In summary, reticulate venation is a type of venation characterized by veins and veinlets that form a web-like network, while parallel venation is when the veins are parallel to each other through the leaf.