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Deutsch: Ascoviridae: Morphology of ascovirus virions. A. Schematic illustration of the structure of a typical ascovirus virion. The virion consists of an inner particle and an outer envelope. The inner particle is complex and contains a DNA/protein core surrounded by an apparent unit membrane, the external surface of which bears a layer of distinctive protein subunits. B, C. Respectively, ultrathin longitudinal- and cross-sections through typical ascovirus virions (SfAV-1a). The dense inner layer corresponds with the distinctive layer of subunits shown in A. D to F. Negatively stained preparations of virions from three different ascovirus species: D, Spodoptera frugiperda ascovirus 1a (SfAV-1a); E, Trichoplusia ni ascovirus 2a (TnAV-2a), and F, Heliothis virescens ascovirus 3a (HvAV-3a). The reticulate appearance of the virions is thought to be due to the superimposition of top and bottom layers of the inner particle and the outer envelope. Bar = 50 nm.