Lecidea tessellata is a species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae.

The apothecial disc is smooth, initially rounded in young apothecia, but becomes convex and irregular in mature ones, sometimes with a thin white pruinose layer.

The hypothecium is pale brown and measures 30–40 μm in height, while the excipulum is blackish-green externally and colorless internally.

Lecidea tessellata contains confluentic acid, a lichen product that can be detected using thin-layer chromatography.

Both the thallus and medulla of the lichen have negative reactions with standard chemical spot tests (K−, C−, PD−).