Which one of the following 'algae' is not known identified partner to

Which one of the following ‘algae’ is not known identified partner to form lichen?

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Nostoc

Stigonema

Trentepohlia

Vaucheria

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UPSC Geoscientist – 2023

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Lichens are formed through a symbiotic association between a fungus (mycobiont) and a photosynthetic partner (photobiont), which is usually a green alga or a cyanobacterium. Common algal photobionts belong to genera like Trebouxia, Trentepohlia, and Pseudotrebouxia. Cyanobacterial photobionts include genera like Nostoc and Stigonema. Vaucheria is a filamentous alga belonging to the Xanthophyceae (yellow-green algae) and is not a commonly known or identified photobiont partner in lichen formation.

– Lichens are symbioses between fungi and photosynthetic organisms (algae or cyanobacteria).
– Nostoc and Stigonema are cyanobacteria known to form lichen associations.
– Trentepohlia is a green alga known to form lichen associations.
– Vaucheria is a yellow-green alga not typically found as a lichen photobiont.

The majority of lichen photobionts are green algae (~90%), with cyanobacteria making up most of the remainder. The specific species involved are often highly specialized for the symbiotic relationship.

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