thallus

/ˈθæləs/

Other forms: thalli; thalluses

Definitions of thallus

1. noun

   a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes
   types:

   crustose thallus

   thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows

   type of:

   plant part, plant structure

   any part of a plant or fungus