In the Chlorophyta, the reserve food of protein surrounded by starch, form a compact body termed as
Pyrenoids are commonly present in the chloroplasts of many algae and also in the bryophyte are associated withthe operation of a carbon-concentrating mechanism (CCM). Pyrenoids are composed of a granular, homogeneous matrix around which are found starch deposits. A filamentous and fibrillar nature of the pyrenoid matrix are present in certain green algae.