[3] After having been transferred to the genera Arthopyrenia, Thelidium, Pyrenocollema in various times in its taxonomic history, Martin Grube and Bruce Douglas Ryan reclassified it to Collemopsidium in 2002, giving it its current name.

Studies of specimens from both Ireland and Norway have shown that the species maintains consistent genetic and morphological characteristics across its range, despite showing some variation in perithecial size.

This order was created to accommodate these marine borderline lichens after genetic analysis showed they formed a distinct lineage that originated around 230 million years ago during the Triassic period.

Its perithecia (fruiting bodies) measure 0.15–0.55 mm in diameter and are usually sessile and roughly spherical (globose, featuring a conical, black, hemispherical involucrellum that spreads laterally.

The species has been found to occupy a relatively narrow ecological range compared to other members of the genus, typically occurring lower in the tidal zone.

Research from coastal sites in Norway and Ireland has shown that while the species can be found across different wave exposure levels, it maintains consistent substrate preferences regardless of local conditions.