Lithacodia uncula has a vast distribution area ranging from the French western Pyrenees to Japan.

In the north it extends to south and central England, Ireland, Scandinavia in the areas around the Baltic Sea, in Finland and northern Russia.

Largely missing in the Mediterranean with the exception of two smaller occurrences on the French Mediterranean coast and in Tuscany, as well as on the northern Adriatic coast (in northern Italy, Slovenia and Croatia).

Also to the south in Bulgaria, Ukraine, Crimea and southern Russia, Central Asia and Siberia.

Forewing olive brown, darker in disc; a broad tannish-peach coloured streak along the costa and another on the inner margin; the orbicular and reniform stigmata tannish peach, whiter edged, confluent with the costal streak; some pale lines before termen, straight and parallel, the innermost white; hindwing paler; the dark-suffused examples are named obscurior Spul.