Thallus

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Thallus

Thallus (pronunciation: /ˈθæləs/) is a term used in botany and mycology to describe the vegetative body of algae, fungi, and some other non-plant organisms. The term is derived from the Greek word "thallos", which means "young shoot" or "twig".

Definition

A thallus usually refers to a structure that is not differentiated into roots, stems, and leaves and lacks an organized vascular system. It can be unicellular or multicellular. In algae, the thallus may be a simple, undifferentiated cell, a colony, or a filament. In fungi, the thallus is often a complex, multicellular structure.

Types of Thallus

There are several types of thallus, including:

  • Foliose - These thalli resemble leaves and are attached to the substrate at various points by structures called rhizines.
  • Fruticose - These thalli are shrubby or bushy, and are attached to the substrate at a single point.
  • Crustose - These thalli are crust-like and are tightly attached to the substrate over their entire lower surface.
  • Squamulose - These thalli are composed of small, scale-like lobes and are loosely attached to the substrate.

Related Terms

  • Algae - A large group of photosynthetic organisms that includes seaweeds and many single-celled forms.
  • Fungi - A kingdom of spore-producing organisms that includes mushrooms, yeasts, and molds.
  • Rhizines - Root-like structures in lichens that attach the thallus to the substrate.

External links

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