This supplement deals with the diagnostic characteristics and literature data of three species of Phoma sect. Plenodomus: Phoma korfii spec. nov. (synanamorph Sclerotium orobanches Schwein.: Fr.), Phoma pimpinellae spec. nov. (teleomorph Leptosphaeria pimpinellae Lowen & Sivan.) and Phoma etheridgei L.J. Hutchison & Y. Hirats. (only known from isolates). They are filed into the key of section Plenodomus and the indices of the section are supplemented.