Common Coralline

Corallina officinalis

''Corallina officinalis'' is a calcareous red seaweed which grows in the lower and mid-littoral zones on rocky shores.
Corallina officinalis I think this was probably a rosy red when fresher - as it is it looks like tiny bones, which is not too far off of the mark. Though it is a red algae it forms a calcified "skeleton" much like a coral. Canada,Corallina officinalis,Geotagged,Summer

Appearance

The thallus of ''C. officinalus'' is firmly attached generally to rock and grows in tufts to a length of 120mm. It has pinnate branching with successive opposite lateral branches. Each frond consists of cylindrical calcified stipes which show segments each a little longer than broad, rising from a crustose base like a string of beads becoming larger and more wedge-shaped higher up the stipe.

It forms calcium carbonate deposits within its cells which serve to strengthen the thallus. These white deposits cause the seaweed to appear pink in colour, with white patches where the calcium carbonate is particularly concentrated, such as at the growing tips. The calcium carbonate makes it unpalatable to most rocky shore grazers.
Calcareous Red Seaweed - Corallina officinalis Fan-shaped tufts, whose thalli consist of hard, jointed segments. Spotted in a tide pool along the Maine coast.

https://www.jungledragon.com/image/61770/calcareous_red_seaweed_-_corallina_officinalis.html
https://www.jungledragon.com/image/61771/calcareous_red_seaweed_-_corallina_officinalis.html Corallina,Corallina officinalis,Geotagged,Spring,United States,bleached Corallina officinalis,coral weed,seaweed,white seaweed

Distribution

''C. officinalis'' is found on solid rock on the North Atlantic coast, from northern Norway to Morocco, and intermittently from Greenland to Argentina. ''Corallina'' is also found in USA, Argentinaand elsewhere including some parts of Japan, China and Australasia.
Calcareous Red Seaweed - Corallina officinalis Habitat: Found in a tide pool during low tide

*I may have placed the seaweed on the rock for the photo, but I can't remember...
https://www.jungledragon.com/image/99931/calcareous_red_seaweed_-_corallina_officinalis.html Corallina officinalis,Geotagged,Summer,United States

Habitat

''Corallina'' grows on rocks in rock pools and occasionally on shells or other algae, at mid-littoral to 33m deep, it provides a habitat for many small animals which feed on the microorganisms dwelling in its dense tufts.

References:

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Taxonomy
KingdomPlantae
DivisionRhodophyta
ClassFlorideophyceae
OrderCorallinales
FamilyCorallinaceae
GenusCorallina
SpeciesC. officinalis