The protoplast develops into a zoosporangium and releases zoospores. Some are holocarpic, which means they only produce a zoosporangium and zoospores. Then, the multinucleate plasmodium forms zoosporangium, which eventually release more zoospores. Others are polycentric, meaning one zoospore gives rise to many zoosporangium connected by a rhizomycelium. Some chytrids are monocentric, meaning a single zoospore gives rise to a single zoosporangium. Monosporangiate species form a single zoosporangium within the host. Both nuclei migrate out of the zoosporangium and into the conjoined rhizoids where they fuse. Cycles through somatic hyphae, zoosporangium, zoospores, encystation & germination, and back to somatic hyphae. The zoospore resides in the zoosporangium until the cell wall of the cyst bursts.