Figure 6.

Serial TEM micrographs for the visualization of the pyrenoid matrix (P) of Tetraselmis jejuensis, which was penetrated by cytoplasmic channels (canaliculi) in various directions. The serial sections were obtained from the apical to the antapical direction in the cell. (a) The pyrenoid was encased in a starch sheath in the upper part. (b–e) It was invaded by canaliculi in the middle part. (f) Another penetration of cytoplasmic materials from a different direction was observed in the pyrenoid in the lower part (black arrow). The circled number in each micrograph indicates the section number in a series of sections. Scale bars = 1 µm.