Definitions

1. noun

A composite organism consisting of a fungus (usually an ascomycete or a basidiomycete) that has formed a symbiotic relationship with one or more photosynthetic partners, such as algae or cyanobacteria.

“The lichen on the rocks in the forest was a vibrant green color due to the presence of algae.”

2. verb

To attach or grow together, especially with a symbiotic or parasitic relationship.

“The fungus lichened itself to the tree, forming a unique relationship.”