| Noun | 1. | Synchytrium - simple parasitic fungi including pond scum parasites fungus genus - includes lichen genera pond-scum parasite - an aquatic fungus of genus Synchytriaceae that is parasitic on pond scum family Synchytriaceae, Synchytriaceae - a fungus family of order Chytridiales potato wart fungus, Synchytrium endobioticum - fungus causing potato wart disease in potato tubers |