Heinjo During’s retirement enables him to focus fully on bryology
Marinus J. A. Werger and Fred J. A. Daniëls
This is a special issue on occasion of the formal retirement of the eminent bryologist Heinjo During, Utrecht University. Marinus J. A. Werger Utrecht University, Netherlands and Fred J. A. Daniels, Münster University, Germany, have acted as guest editors.