The botany of the Antarctic voyage of H.M. discovery ships Erebus and Terror in the Years 1839-1843, London, Reeve Brothers, 1844-1860, Chondria opuntioides, Coeloclonium tasmanicum, William Henry Harvey, artist, algae, The illustration features a detailed representation of **Chondria opuntia**, a red algae species. The central part showcases a branching, frond-like structure with numerous intricate lobes and filaments, highlighting the delicate texture and pattern typical of marine algae. Surrounding this main specimen are several smaller illustrations depicting various reproductive structures, including oval and elongated forms, which represent the cystocarps and other life stages. The image emphasizes the complexity of this algal species, reflecting its natural beauty and biological significance in marine ecosystems.