What is another word for thallus?
Pronunciation: [θˈaləs] (IPA) 
The word thallus is used in biology to describe a plant or fungus body that lacks roots, stems, or leaves. Synonyms for thallus include frond, blade, and frondescence. These words are used to describe the same type of body structure, where the plant or fungus has a flat, leaf-like shape that covers the surface it grows on. Other synonyms for thallus include gametophyte, sporophyte, and alga. Each of these terms is used to describe specific types of thalli, depending on their function, life-cycle, and morphology. Despite the variety of synonyms used for thallus, each term refers to a unique and important type of organism in the natural world.
