The asexual cells are termed tetraspores on account of the usual occurrence of four in each sporangium.
2
The outer walls of the sporangium now become hard, and the whole falls off as a seed.
3
Aplanospores would seem to represent zoospores arrested in their development; without reaching the stage of motility, they germinate within the sporangium.
4
The spores are formed in a manner very similar to those of the mosses, and are set free by rupture of the sporangium.
5
From each locule of a plurilocular sporangium there is set free an oosphere, which, being furnished with a pair of cilia, swarms for a time.