Each disc is surrounded by a rim (called an exciple) that is made up of tightly packed fungal cells, giving it a tissue-like appearance under the microscope.

These asci have a distinctive internal structure that can be seen when stained with iodine solution, showing a characteristic pattern (known as the Tamasia-type) that helps distinguish this genus from its relatives.

[2] Tamasia fijiensis is known only from a single location in Fiji, specifically from the cloud forests of Viti Levu, the largest island in the Fijian archipelago.

The forest canopy in this habitat is dominated by Cyathea tree ferns and Alpinia boia, a tall member of the ginger family that grows to 3–4 metres in height.

However, similar high-elevation tropical forests exist elsewhere in the South Pacific region, and future surveys may reveal the species to be present in other locations.