This 25 January 2018 video says about itself:

What’s in a Lichen? How Scientists Got It Wrong for 150 Years | Short Film Showcase

For 150 years, scientists believed lichen were defined by a symbiotic relationship between a fungus and algae. Meet the team of researchers who upended this belief in this short film by Andy Johnson, Talia Yuki Moore, Chris A. Johns, and Kate Furby.

From the Field Museum in the USA:

When the dinosaurs died, lichens thrived

Mass extinction hurt land plants, but DNA shows that some fungus/plant combo organisms rose up

June 28, 2019

Summary: When the asteroid hit, dinosaurs weren’t the only ones that suffered. Clouds of ash blocked the sun and cooled the planet’s temperature, devastating plant life. But fungi, which decompose dead stuff, did well. So what happened to the lichens, which are made of a plant…