cladochytrium

from The Century Dictionary.

• noun A genus of phycomycetous fuugi of the family Cladochytriaceæ, having a well-developed mycelium in the tissues of the host and producing uniciliate zoöspores, but no resting-spores, so far as is known. Cladochytrium tenue is parasitic upon sweet-flag, Acorus Calamus, and produces swellings on submerged parts of the plant.