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从野外采集的水绵标本,由于正在进行旺盛的光合作用,细胞质中的带状叶绿体宽、厚,并且高度螺旋,遮挡了其他结构。如果在培养皿里用水培养少量水绵,避光放置五天左右,当水绵呈浅绿色时再做实验,用低倍镜即可清楚观察到水绵细胞的结构:（1）带状叶绿体变得又窄又薄、开始解开螺旋;叶绿体数目可辨;有一列淀粉核排列在叶绿体的中轴上。（2）细胞核悬浮在细胞中央,细胞核周
The water-swollen specimens collected from the wild, because they are undergoing vigorous photosynthesis, the band-like chloroplasts in the cytoplasm are wide and thick, and they are highly spiraled, obscuring other structures. If a small amount of Spirogyra is cultivated with water in a petri dish, it is left standing in the dark for about five days. When the Spirogyra is light green, the experiment is performed again. The structure of the Spirogyra cells can be clearly observed with a low power microscope: (1) Banded chloroplasts It becomes narrow and thin and begins to unravel the spiral; the number of chloroplasts is discernible; there is a column of starch nuclei arranged on the central axis of the chloroplast. (2) The nucleus is suspended in the center of the cell, the nucleus