1. One of the most important changes in historical times must have been the development of the Lake Al (Almere) and later the Zuiderzee, which seriously enlarged the habitat for this species.
2. Under the direction of A. Brokke (Arcadis), the author participates in the project as an archaeobotanist.
3. US-patent 4016084 (1977) concerns compressed common eelgrass leaves as a fire retardant.
4. Wouter van der Meer, BIAX-Consult, firstname.lastname@example.org.