[6] Inside the galls, P. superveniens has a complex internal structure composed of fungal tissue (called stroma) containing numerous small chamber-like cavities (known as perithecioid locules).

[6] The spores themselves have distinctive features: they are divided into four sections by three cross-walls (described as 3-septate), measure approximately 30–35 by 4.5–6 μm, and possess a clear outer coating (perispore).

When treated with potassium hydroxide (KOH) solution, the brownish pigment in the upper layer of the fungal discs turns a dark reddish colour, which is useful for identification purposes.

The fungus has been found growing on its host lichen on various tree species, including aspen, rowan (Sorbus aucuparia), and goat willow (Salix caprea).

For example, it was not detected during an extensive survey of Norwegian rainforest lichens, suggesting it may be genuinely scarce rather than simply overlooked, despite being relatively easy to spot in the field due to its distinctive appearance.