Video material Chytrid infecting green algae Planktothrix vs Amoeba vs Chytrid Autumn in lake Stechlin Zoospore release Zoospores attack pollen Chytrid infecting green algae Early chytrid infection stage on a motile colonial green algae. Planktothrix vs Amoeba vs Chytrid Chytrid zoospores and an amoeba "competing" for a Planktothrix meal. Autumn in lake Stechlin Snapshot of an autumn day in mesotrophic Lake Stechlin (Germany). Zoospore release A chytrid has completed its infection cycle on its desmid host Staurastrum. Mature zoospores swim out of the sporangium and will need to find a new suitable host to infect and reproduce. Zoospores attack pollen Chytrid zoospores attacking a pollen grain.