For more than 90% of the figures (mostly drawn during 1976-1990), either a scale, or the given magnification, will allow the user to derive accurate measurements, even when these are lacking in the diagnosis.
1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, page x