Occurrence and structure of intranuclear crystals in Chara cells

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Abstract
New intranuclear crystals were described in cells of Chara vulgaris. These were needle-like structures extending for about 8 μ in length and 350mμ×110mμ in transverse dimensions. Each crystal was composed of hexagonally-packed, tubular structures about 200–240 Å in diameter, apparently running parallel to each other along the longitudinal axis. Such crystals appeared to pass through one of the several nucleoli in each nucleus. It is suggested that the crystals are proteins having a storage function, which are synthesised in the nucleolus.