Buellia lordhowensis is a little-known saxicolous (rock-dwelling), crustose lichen species in the family Caliciaceae,[2] first described in 2020.

[1] Buellia lordhowensis is characterised by a crust-like body (thallus) that varies in texture from cracked (rimose) to a cracked-tile appearance (rimose-areolate), spreading up to 55 mm wide.

The individual tile-like segments, called areoles, are either tightly clustered or spread out, ranging in size from 0.2 to 0.8 mm, with an irregular, angular, and flat shape.

The inner layer of the thallus (the medulla) is white and lacks calcium oxalate, as it does not react to sulphuric acid and iodine tests.

The reproductive structures of the lichen, known as apothecia, are tiny (0.1–0.25 mm wide), lecideine in form, and appear level with or immersed in the thallus.

This rim has an outer zone that is aeruginose-black, measuring 25–35 μm thick, while the layer just above the spore-producing tissue (epihymenium) is dark brown to bluish-green.