At free end of each sterigma is formed an oval body—a spore or "gonidium" (d), which, when ripe, is thrown off from the sterigma.
The motile force is imparted to the gonidium by dense rows of waving cilia with which it is completely surrounded.
An asexual reproductive cell found in certain algae that form colonies. Gonidia undergo repeated mitoses to form new colonies, which then hatch out of the parent colonies.
A chlorophyll-bearing, photosynthetic algal cell housed in the thallus of a lichen.