Hi Susquihanna,
I would measure it as follows: the widest point across the fruiting body “collas” for the width, and from the tip to the last node vertically. Unfortunately, I can’t attach a picture to this message. But if you have any questions, feel free to reach out again!
A little tip: make sure to give your plants enough PK nutrients during the flowering phase. I use, for example, Canna PK 13/14 or BioBizz Bio Bloom.
“Calium” 😉