Fig. 3

Transmission electron micrographs of life stages representative of Aphelidiaceae. a Host cell (H) with a remnant cyst (C) attached to host via an appressorium (Ap) and infecting the host with a penetration tube (PT). Parasitoid plasmodium (PP) has engulfed much of the host cytoplasm. b Parasitoid plasmodium cleaved into multiple uninucleate cells (Z) delineated by cleavage furrows (CF); a residual body (RB) remains. c Cleaved zoospores, one with a flagellum (F); flagellar cross-sections (FXs) also visible. d An evacuated sporangium that retained a zoospore and the residual body. e An empty sporangium with ephemeral remnant of zoospore cyst. f An evacuated sporangium with a residual body. Figs. A, E = Am. occidentale (FD 01); Fig. B–D = Aph. desmodesmi (FD 104); Fig. F = Aph. protococcorum (FD 95) Bars: A–D, F = 2 μm, E = 1 μm)