Abstract
The development of the gametophyte of Pteridium aquilinum was examined in the presence of several biochemical agents. These compounds, by virtue of their influence on the processes of cell division and cell elongation, brought about a change in the gross morphology of the gametophyte. It was thus reconfirmed that a change in the form of the gametophyte may be explained in terms of differential cell behavior. This interpretation was extended to include the response of the gametophytes to several amino acid and nucleic acid analogues. It was also demonstrated that there is no quantitative increase in protein concentration associated with the development of a 2-dimensional structure and it was suggested that an examination of gametophyte morphology in terms of an interaction of cell division and cell elongation may provide a better insight into the problem of gametophyte morphogenesis.