The lichen begins as small, rounded patches a few millimetres wide, which may eventually coalesce into larger areas exceeding 1 centimetre in diameter.

Here, Lepraria bergensis was found growing on mosses covering west-facing rock surfaces ranging from nearly vertical to slightly sloping.

[1] Subsequent genetic analysis showed that Lepraria bergensis is basal to a clade consisting of the species L. isidiata and L. santosii.

These lobes can be a few millimetres wide and have sharply raised margins that reveal a white lower surface with colourless hyphae projecting outward.

[1] The thallus of Lepraria bergensis shares similarities with Leproloma membranaceum, as both form small rosettes with well-defined, rounded lobes and elevated margins.

[1] In muscicolous specimens, the marginal lobes of Lepraria bergensis are less distinct, forming small rosettes similar to L. borealis and L. caesioalba.

In its type locality, Lepraria bergensis is relatively common, frequently intermingling with Leproloma membranaceum to create mosaic-like patterns.

[1] Lepraria bergensis was later reported by Alan Orange from a spruce plantation in Brynmawr (Great Britain) in 2005,[4] and was formally documented from Deville, Ardennes (France) in 2007.