This paper describes open-ended experimentation with the fungus Pilobolus for laboratory work by high school students. The fungus structure and reproduction is described and sources of the fungus are suggested. Four areas for investigation are suggested: the effect of a diffuse light source, the effect of a point light source, the effect of light intensity, and the effect of different colors of light. Questions are also raised that additional experiments could be designed to explore. Also inlcuded is a list of publications concerning additional information on Pilobolus. (BR)