Caloplaca sterilis

It is primarily found in steppe and sand dune habitats in the Black Sea region, and has been recorded from Bulgaria, Romania, southwest Russia, and Ukraine.

It is easily overlooked and challenging to identify when completely sorediate and sterile (i.e., without any apothecia), especially as its soredia do not contain the typical Sedifolia-grey pigment.

The type specimen was collected by the second author from cape Tarchankut on the coast of the Tarkhankut Peninsula, in the Chernomorsky District of Ukraine.

[2] Soralia develop on the margins of areoles or occasionally on the thallus surface, and are greenish or greenish-grey, measuring 80–250 μm.

The soredia's unique colour within the Caloplaca cerina species complex is noted for its lack of Sedifolia-grey.