Corallina officinalis Linnaeus (A)

This is a highly distinctive element in the NW Atlantic flora being the only articulated (alternating genicula and intergenicula) coralline species. Although fronds are typically distichus and oppositely pinnate in their branching (Image A), habit can differ markedly with environment. Regardless, all individuals tested to date form a single genetic group (Hind & Saunders 2013).

This species occurs from the low intertidal on exposed rock and in tidepools to subtidal depths of 20 m at exposed to semi-sheltered sites. We have genetically verified collections from RI to northern Newfoundland (island), NL, and this species is widespread in the NW Atlantic flora.


Image A. Specimen from Lepreau, NB (GWS003576).