It was collected in Norway and belongs to the genus Sagiolechia, which is part of the larger family of lichens Sagiolechiaceae within the order Ostropales.

[2] Sagiolechia monoseptata has a thin, pale greyish-green thallus (the main body of the lichen), which is smooth or slightly granular in texture.

[2] At the time of its original publication, Sagiolechia monoseptata was known to occur only from its type locality in northern Norway, specifically in the Nordland region.

It was discovered growing on the shaded, horizontal surface of a siliceous rock under a boulder in a small, steep scree facing north.

[2] This species appears to be restricted to a cold, boreal environment and may only occur in similar shaded, rocky habitats in the Northern Hemisphere, although further research is needed to determine its full range.