The phyllosphere of terrestrial plants bathes in the fluid of the troposphere in the same way as aquatic plants bathe in water. The resulting continuum from aerial plant surfaces to the atmosphere provides a pathway for dissemination that is facilitated by convective and adiabatic air movements. This can transport aerodynamically light microbial cells and spores hundreds to thousands of kilometers within, and perhaps beyond, the troposphere to habitats whose conditions can be markedly different from those on plant surfaces. Once entrained in the atmosphere, many microorganisms require active mechanisms to overcome their buoyancy and deposit back to Earth’s surface. Although many of the processes of this voyage, such as emission rate and the duration of specific trajectories, have not been clearly assessed, the voyage is inevitable for most species of phyllosphere inhabitants. This raises important questions about the sense of “phyllosphere ecology” and the corps of adaptations that defines fitness in the phyllosphere. It also raises fascinating questions about plants as moderators of atmospheric processes that are mediated by microorganisms commonly found on plant surfaces.