Green Algae - Origins

Origins

The chloroplasts of green algae are bound by a double membrane, so presumably they were acquired by direct endosymbiosis of cyanobacteria. A number of cyanobacteria show similar pigmentation (e.g., Prochloron), and cyanobacterial endosymbiosis appears to have arisen more than once, as in the Glaucophyta (Cyanophora) and red algae. Indeed, the green algae probably obtained their chloroplasts from a Prochloron-type prokaryotic ancestor, and evolved separately from the red algae.

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