Abstract
Observations of young leaf primordia give information about the origin of the fertile spike ofOphioglossum pedunculosum Desv. Each primordium shows a certain asymmetry that is visible in form and position of the fertile spike primordium, but above all in the course of the marginal meristem. The fertile spike primordium is connected with the marginal meristem on the right or that on the left side of the sterile segment. On the basis ot these observations the following concept of the origin of the fertile spike is formed: The marginal meristem curves on one side of the leaf primordium and turns towards the ventral side. This process is followed by meristem fractionation in the course of which the smaller part curved towards the middle of the leaf primordium becomes independent and initiates the development of the fertile spike, whereas the larger part of the marginal meristem contributes to the growth of the sterile segment.
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Decker-Eisel, C., Hagemann, W. Untersuchungen über den Ursprung der fertilen Fieder vonOphioglossum pedunculosum . Pl Syst Evol 130, 143–155 (1978). https://doi.org/10.1007/BF00983078
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DOI: https://doi.org/10.1007/BF00983078