| The oospore on germination usually gives origin to a zoosporangium, but may form directly a germ tube which infects the host. |
| In the first process, zoospores escape from the zoosporangium which is located in the parent algae and they develop into filaments. |
| After a few days, the plasmodium cleaves into multinucleate portions, each of which develops into a zoosporangium. |
| The zoospore encysted and within 24 hrs branched rhizoids formed and the cyst began to enlarge to form a zoosporangium. |
| This zoosporangium is nearly empty but still contains a few motile zoospores. |
