Completed zoospore formation in Rozella. A. Zoospores of R. allomycetis [strain CSF 55; Powell et al. 2017] in host Allomyces arbuscula; septum separating host from parasite was induced by parasite. B. Zoospores of R. allomycetis [strain CSF 55] being released through a discharge pore. C. Zoospores of R. multimorpha [strain JEL 883; Letcher et al. 2018] in host Pythium catenulatum; some spores are in the discharge tube. Abbreviations: CB, concentric body; DP, discharge pore; DT, discharge tube; FP, flagellar pool; H, host; P, parasite; S, septum; Sp, sporangium; Z, zoospore. Bars = 5 µm.