11 species and subspecies of the genus Disphyllum de Fromentel are described from the Devonian of Poland, two of them, D. wirbelauense bonae and D. w. regulare, are new. The geological structure of the Disphyllum-bearing localities from the Holy Cross Mts and Sudetes is discussed. The profiles of deep boreholes from Silesian-Cracow anticlinorium and Pomerania are presented. The coral's blastogeny and intraspecific variability are characterized. The septal index and pattern of internal structure are regarded as taxonomical criteria for specific identifications. It was noted that the microstructure is characterized by coarse monacanths distributed horizontally or in the form of half-fans. Distribution of Disphyllum in Poland and in the world, the moment of its appearance and its biostratigraphical value are discussed.