''Calliarthron tuberculosum'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of thalloid intertidal

alga Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular mi ...

Distribution and habitat

''Calliarthron tuberculosum'' is found on the west coast of North America, from the Baja California Peninsula to the

Alaska Panhandle Southeast Alaska, colloquially referred to as the Alaska(n) Panhandle, is the southeastern portion of the U.S. state of Alaska, bordered to the east and north by the northern half of the Canadian province of British Columbia (and a small part ...

. South of Monterey Bay, California, ''C. tuberculosum'' overlaps with ''C. cheilosporioides''; as the two species are quite similar, distinguishing the two can be quite hard. Molecular sequencing or detailed measurements are required to separate them. It is commonly found in "low intertidal tidepools in moderate to exposed habitats".

References

Corallinaceae Algae {{Rhodophyta-stub