Specialized cells for fixing atmospheric nitrogen in Nostoc are:

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Heterocyst are found in many species of filamentous blue-green algae. They are cells of slightly larger size and with a more thickened wall than the vegetative cells. heterocyst are the site of nitrogen fixation in blue-green algae. The role includes: (i) fixation of nitrogen by all heterocystous algae, (ii) inhibition of heterocyst formation by combined nitrogen and (iii) direct observations on acetylene reduction by isolated heterocyst. Related Theory Heterocysts are specialized, paleyellow, thick-walled cells wi