Cross section of a Chlamydomonas reinhardtii algae cell, a 3D representation
DIC image of Scenedesmus quadricauda with the pyrenoid (central four circular structures) clearly visible.
C. reinhardtii trajectory, in HSA (culture medium), under red light.

It has a cell wall made of hydroxyproline-rich glycoproteins, a large cup-shaped chloroplast, a large pyrenoid, and an eyespot that senses light.

- Chlamydomonas reinhardtii

In the unicellular red alga Porphyridium purpureum, individual thylakoid membranes appear to traverse the pyrenoid; in the green alga Chlamydomonas reinhardtii, multiple thylakoids merge at the periphery of the pyrenoid to form larger tubules that traverse the matrix.

- Pyrenoid

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