The structures of the chloroplasts of higher cells resemble largely that of mosses. Their chlorophyll is unevenly distributed. Here become the differences between grana and stroma very obvious. The uniformity of the chloroplasts of all higher plants points out that the optimal form has been found rather early in evolution and has not been changed since. This is different with algae.
Many species have just one chloroplast that covers nearly the whole space of the cell's interior.
The disc-shaped chloroplast of Mougeotia can be viewed either from above or in profile depending on the amount of light used. Its rotation is an experimentally well-analyzed example of an induced chloroplast movement . Chromoplasts are red, orange or yellow coloured plastids. The colour is normally caused by the presence of yellow xantophyll and yellow to red carotinoids . Both compounds do also exist in chloroplasts, but are concealed by chlorophyll.