To which phylum do the algae most commonly found in lichens belong?

The algae most commonly found in lichens typically belong to the phylum Chlorophyta, which includes green algae. In some cases, cyanobacteria, which are not true algae but rather photosynthetic bacteria, can also be present in lichens. These photosynthetic partners are crucial for the lichen's ability to produce food through photosynthesis, contributing to the symbiotic relationship with fungal partners.