Abstract
Summary In contrast to what is known about growth of gametophytes of the ferns Adiantum capillus-veneris and Dryopteris filix-mas in red light, the results presented demonstrate that a certain percentage of gametophytes of both species can undergo a transition to biplanar growth under red irradiation whether this is given continuously or interrupted by a dark period of several weeks.Unlike blue light-grown prothallia, two-dimensional development in red light only occurs after the formation of a fairly long filamentous part.
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