title: An Age-Dependent Change in the Response of Fern Gametophytes to Red Light.
abstract: When gametophytes of Onoclea sensibilis are grown in darkness a filament of a few cells develops which elongates at a constant rate. Low dosages of red light given at the beginning of growth increase the rate of elongation. After about 12 days in darkness, however, gametophytes show a decreased growth rate when given red light.
authors.forename: J H
authors.initials: JH
authors.lastname: Miller
authors.forename: D R
authors.initials: DR
authors.lastname: Wright