Rhizoctonia solani, the foremost widely known species of Rhizoctonia was originally represented by Julius Kühn on potato in 1858. Rhizoctonia solani may be a basidiomycetous fungi plant that doesn't manufacture any agamogenetic spores (called conidia) and solely often can the plant manufacture sexual spores (basidiospores). In nature, R. solani reproduces asexually and exists primarily as vegetative plant structure and/or sclerotia. In contrast to several basidiomycetous fungi, the basidiospores aren't confined in an exceedingly fleshy, plant organ or mushroom. The sexual mature structures and basidiospores (i.e. teleomorph) were 1st discovered and represented well by Prillieux and Delacroiz in 1891. The sexual stage of R. solani has undergone many name changes since 1891, however is currently called Thanatephorus cucumeris.

The vegetative plant structure of R. solani and alternative Rhizoctonia fungi square measure colorless once young however become brown coloured as they grow and mature. The plant structure consists of hyphae divided into individual cells by a septum containing a dough-nut formed pore. This body part pore permits for the movement of living substance, mitochondria, and nuclei from cell to cell. The hyphae usually branch at a 90o angles and typically possess quite 3 nuclei per hyphal cell. The anatomy of the body part pore and also the cellular nuclear variety (CNN) are used extensively by researchers to differentiate R. solani from alternative Rhizoctonia fungi.