Figs. 23-26. Developmental stages of discharge papillae for a variety of sporangial discharge forms.

Fig 23. Zoospore discharge from an inoperculate papilla.

Fig 24. Dehiscence and discharge from an exo-operculate papilla.

Fig 25. Endo-operculate discharge papilla from which zoospores are released en masse and passively.

Fig 26. Endo-operculate discharge in which zoospores are explosively released.