Carbonea austroshetlandica is a species of lichenicolous fungus belonging to the family Lecanoraceae.

[1] Carbonea austroshetlandica has dispersed to aggregated ascomata, which are up to 0.3 mm in diameter, abruptly becoming convex with excluded margin.

Hypothecium and exciple are dark brown and the epihymenium is greenish.

The hymenium is hyaline, 35–48 μm high and stains blue with KI solution.

Paraphyses are branched and anastomosing, slightly enlarged at the apex.