Definitions

1. noun

A thallus is the vegetative part of a plant, especially a fungus or an algae, that is not differentiated into roots, stem, and leaves.

“The biologist studied the thalli of the algae species in the laboratory.”

2. noun

In lichens, the thallus is the entire organism, including the fungus and the photosynthetic partner.

“The lichen’s thallus was a vibrant green color due to the presence of algae.”

3. noun

In some fungi, a thallus is a mass of hyphae that resembles a vegetative part of a plant.

“The fungal thallus had engulfed the surrounding soil, breaking down organic matter.”