The species epithet honours the Norwegian lichenologist Tor Tønsberg, on the occasion of his 70th birthday.

The ascomata form in small, non-aggregated colonies, with an irregularly rounded to short elliptical shape.

The proper exciple is composed of compacted paraphysoidal hyphae, while the hymenium is conglutinated and 35–40 μm tall, with distantly spaced asci.

Paraphysoids are loosely branched, netted, and embedded in a dense gelatinous matrix, with tips that widen and have dark brownish pigment granules or plaques.

The ascospores are hyaline (translucent), contain a single septum, and slipper-shaped, measuring around 12.6 by 4.7 μm on average.