XANTHIDIUM
\zanθˈɪdi͡əm], \zanθˈɪdiəm], \z_a_n_θ_ˈɪ_d_iə_m]\
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A genus of minute unicellular algae of the desmids. These algae have a rounded shape and are armed with glochidiate or branched aculei. Several species occur in ditches, and others are found fossil in flint or hornstone.
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