Primary photobiont

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primary photobiont (noun, pl. primary photobionts) – literally: the first photosynthetic partner (photobiont) that a lichen symbiosis acquires; in a more general sense: the main and predominant photobiont in a lichen thallus. Most lichens are characterized by populations of green algae as primary photobiont (chlorolichens, phycolichens), but nevertheless can have blue-green algae as secondary photobiont. Most lichen mycobionts are primarily associated with a particular photobiont genus, but occasionally additional cells, that are less characteristic, may occur as accessory photobiont.

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