The cyanobacteria found in the internal mucilage-filled cavities of hornworts serve to

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The cyanobacteria found in hornworts are capable of fixing atmospheric nitrogen gas into a form that can be used by the plant. This relationship between hornworts and cyanobacteria is an example of symbiosis, where both organisms benefit from their interactions. The cyanobacteria provide the hornworm with a source of nitrogen, while the hornwort provides the cyanobacteria with a protected and nutrient-rich environment.

The Cyanobacteria Found in the Internal Mucilage-Filled Cavities of Hornworts