https://www.algaebase.org/search/species/detail/?species_id=111
Lithothamnion glaciale Kjellman 1883
This name is currently regarded as a synonym of Boreolithothamnion glaciale (Kjellman) P.W.Gabrielson, Maneveldt, Hughey & V.Peña.

https://www.inaturalist.org/flags/677703