Summary
During oogenesis in Chara fibrosa, and in the enlarging, young daughter coenobia of Volvox spec., microtubule-like structures were found in growing plastids. These were appreciably bigger than the usual 240 Å cytoplasmic microtubules, measuring about 320 Å in diameter; a helical or banded organisation in the wall of these tubules was also evident. The tubules were generally present in greatest numbers when the plastids were elongating or enlarging.
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Pickett-Heaps, J.D. Microtubule-like structures in the growing plastids or chloroplasts of two algae. Planta 81, 193–200 (1968). https://doi.org/10.1007/BF00417448
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DOI: https://doi.org/10.1007/BF00417448