Ralfsia verrucosa is crustose brown alga (Phaeophyceae). Cape Ras, Girona, Catalonia, Spain. Mediterranean Sea.

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Photo credit: © José María Barres Manuel / Alamy / Afripics
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Keywords: alga, algae, botany, brava, brown, cabo, catalonia, coastline, costa, crustose, girona, heterokontophyta, horizontal, mediterranean, ochrophyta, paeophyceae, ralfsia, ras, sea, seaweed, spain, verrucosa