Altered unisons

Altered unisons occur when two or more notes of the same name in the same octave have different accidentals in the same chord, such as D♯ and D♭.

In Dorico, this is notated with a split stem, sometimes known as a cherry stalk or a tree, which allows both notes to appear with their corresponding accidental directly beside them.

You can also have altered unisons appear with a single stem, meaning noteheads appear directly beside each other, and the two accidentals are shown beside each other to the left of the chord.