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Annals of Botany 23: 257-260, 1959
© 1959 Annals of Botany Company

RESEARCH-ARTICLE

An Electron Microscope Investigation into the Structure of the Floridean Pit

A. MYERS1, R. D. PRESTON and G. W. RIPLEY

Botany Department, University of Leeds

Ultra-thin sections of the red algae Rhodymenia palmata and Laurencia caespitosa were examined in the electron microscope in order to determine the fine structure of the Floridean pits. The pits found in the two species examined are shown to be quite different from each other, in Rhodymenia the pit is open so that the cytoplasm is continuous through the cell wall, whilst in Laurencia the pit is completely closed by a lamella of the cell wall. These two types are shown to be equivalent to those described by Jungers (1933) on the basis of light microscope observations.


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