Calliarthron tuberculosum is a species of thaloid intertidal red algae.

C. tuberculosum was originally described as Corallina tuberculosa in 1840 Alexander Postels and Franz Ruprecht.

[2] Calliarthron tuberculosum is found on the west coast of North America, from the Baja California Peninsula to the Alaska Panhandle.

[3][4] It is commonly found in "low intertidal tidepools in moderate to exposed habitats".

[3] South of Monterey Bay, California, the range of C. tuberculosum overlaps with the range of C. cheilosporioides; as the two species are quite similar, molecular sequencing or detailed measurements are required to distinguish them.