Summary
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1.
Fixation in osmium, dehydration, and embedding of frond cells ofFucus vesiculosus L. proved to be more successful in winter than in summer, possibly because of biochemical changes in the cytoplasm or changes in permeability with the season.
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2.
There was no apparent change in the ultra-structure of chromoplasts from summer to winter. Six different lamellae, formerly believed to be four, were observable in a packet, and about 13 such packets across the thick part of the chromoplast. Globuli in chromoplasts appeared to consist of two membranes and have optically empty centers.
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3.
Cytoplasmic vacuoles appeared nearly filled in winter with an electron-dense material, while in summer, vacuoles were not so-filled, and some of the summer vacuoles appeared smaller than in winter.
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Parker, J., Philpott, D.E. Cellular ultra-structure ofFucus vesiculosus frond in summer and winter. Protoplasma 57, 628–635 (1963). https://doi.org/10.1007/BF01252081
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DOI: https://doi.org/10.1007/BF01252081