Thanatephorus cucumeris

"R. solani" does not produce spores, hence is identified only from mycelial characteristics or DNA analysis. Its hyphal cells are multinucleated. It produces white to deep brown mycelium when grown on an artificial medium. The hyphae are 4–15 μm wide and tend to branch at right angles. A septum near each hyphal branch and a slight constriction at the branch are diagnostic. "R. solani" is subdivided into anastomosis groups based on hyphal fusion between compatible strains.