Figs. 18-22. Karlingiomyces exooperculatus.

Fig 18. Germinated zoospore with enlargement evident in germ tube.

Fig 19. Stage in sporangium development.

Fig 20. Pyriform sporangium (right); sporangium with elongate exit tube (left); note thickened exo-operculum.

Fig 21. Smooth, thick-walled resting spore containing a single, large refractive globule.

Fig 22. Zoospores, each with a single, posteriorly oriented, refractive globule.