Xanthidium /(?)/

Xan·thid·i·um

Xanthidium

n.

pl. Xanthidia

  1. 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. (Bot.)