[3] Niorma hosseusiana has a fruticose (shrub-like) thallus that is densely branched and measures approximately 10–15 mm (0.4–0.6 in) in diameter.

Its main lobes are flattened and clearly dorsiventral (having distinct upper and lower sides), with widths ranging from 0.5 to 1.5 mm.

This surface is smooth, frequently marked with striations, and lacks both a hairy (tomentose) texture and powdery coating (pruinose).

[4] The lichen's underside is mostly devoid of a protective outer layer (decorticate), presenting a flat to channel-like (canaliculate) appearance.

Its underside is coarse, featuring a texture that varies from granular to net-like, and its colour spans from pale yellow to grey.