Abstract
Gametophytes of the fern Pteridium aquilinum were incubated 3 days in red light and then transferred to white light. The sequence of events occurring after the transfer was as follows: a swelling of the apical region within 1 hr; a reduction in cell elongation after 5 hr; a series of one‐dimensional cell divisions between 10‐25 hr; and the initiation of two‐dimensional gametophytes after 25‐50 hr. The percentage of two‐dimensional gametophytes was proportional to the logarithm of the intensity of white light. The rate of elongation after 5 hr was inversely proportional to the logarithm of the intensity. The rates of cell divisions for one‐ and two‐dimensional gametophytes were proportional to intensity up to 240 and 120 ft‐c, respectively.
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