The upperside of the forewings are often noticeably darker brown than other Pyrgus species, especially when fresh, with clear white markings.

Compared to Pyrgus alveus, however, the white spots on the upper side of the hind wing are clearly lighter.

To the east, the distribution area extends to southern Russia and across Asia Minor to Iran.

[4] The habitats of Pyrgus armoricanus include a wide range of open land locations with raw soils.

In Bavaria records known so far extends from approximately 190 m in Main Franconia to a little over 800 m above sea level on the edge of the Alps.

Eggs are laid on plants in full sun, which mostly grow over open soil or dark litter (e.g. also dry floating debris on river banks).

In these, Pyrgus armoricanus shows particularly strong population fluctuations with temporary complete extinction on individual areas, which is to be interpreted as an indication of a metapopulation structure.

[2] Both females and males of Pyrgus armoricanus orient themselves visually and specifically look for areas with little vegetation for sunbathing as well as in search of potential egg-laying plants.

[6] In southern Scandinavia (Sweden and Denmark), however, the main larval food plant is Filipendula vulgaris and to some extent also Helianthemum nummularium.

Basically for Pyrgus armoricanus, under favorable climatic conditions there is the potential for strong and rapid spread.

Sheep grazing, especially with the low to medium intensity that is predominantly common today, is not sufficient in all locations to create the necessary gaps in vegetation structure and should therefore be supplemented with additional measures depending on the area.

In addition, new pioneering sites can be created in the course of compensatory measures by staggered top soil removal.