Portuguese Early Music Database (PEM)

Medium-size neumes around a red line. There are several instances where the difference between a lozenge and a more or less square punctum is not clearly defined  because the punctum has the lateral borders tilted to the right (like a parallelogram). The lozenge for the lower semitone is not used consistently.  It is used either as simple neume or as part of an ascending or descending patter of two or more notes on one syllable. Custodes consistently used.