Verrucaria rhizicola is a rare species of corticolous (bark-dwelling), aquatic, crustose lichen in the family Verrucariaceae.

Found in France, it was formally described as a new species in 2011 by lichenologists André Aptroot and Holger Thüs.

The type specimen was collected by the first author from the Forêt de Boulogne [fr] (Pas-de-Calais).

There, the lichen was growing on the roots of common alder (Alnus glutinosa).

In addition to its uncommon habitat, other unique characteristics of this species are the prominent, minute, shiny ascomata that have a distinctive dimidiate involucrellum (the upper, often pigmented part of ascocarps), and the asymmetrically kidney-shaped ascospores.