Ornamental initials (Ordinary of the Mass)
These are among the twenty-seven ornamental initials that feature occasional caricature-like heads sprouting from the foliage (hotspot 1). Initials of this type are found in only two bifolios (fols. 131-132 and fols. 273-274). They were most likely painted by Bartolomeo di Fruosino whose only recorded payment for work on the Missal specifies the provision of twenty-seven illuminations.