Second staff&colon; isorhythmic tenor as notated in mensural notation. It is the equivalent of the "fusa" in mensural notation . The note derives from the "semifusa" in mensural notation. The system of note types used in mensural notation closely corresponds to the modern system. Ligatures are characteristic of neumatic (chant) and mensural notation. None of them survive in mensural notation. His dissertation was on early ligatures and mensural music. The note derives from the ('half minim') of mensural notation. See mensural notation (ligatures). See "Mensural notation" for examples. The carols are noted in mensural notation on five-line staves. The mensural time signature indicated which note value corresponded to the tactus. Mensural notation may contain a number of other symbols. Mensural notation was extensively described and codified by contemporary theorists. All his melodies are written in bar form, with no mensural notation.