Pseudochorales constitute a diverse repertoire group, which has not yet undergone a thorough research. The present article undertakes this problem as exemplified by the manuscript graduals of the Congregation of the Mission. Apart from pointing to the concordance and repertoire similarities, the author analyses the question of multivocalism, performance practice and contemporary reception of pseudochorale singing. The most important aspect of the article is the double-voice Missa Varsaviensis from the 1769 Pro Festis Solemnioribus in Stradom and its concordance in the sources of the Bernardine Fathers.