The vegetative body of the fungus is known as thallus. Thallus may be mycelial or non-mycelial. Non-mycelial thallus is present in the lower fungi and mycelial thallus in the higher members of the fungi. The whole mass of profusely branched interwoven hyphae is known as Mycelium. Hyphae are tubular filaments having profuse branching. If the hyphae is a septate i.e. without cross walls between the cells; with continuous flow of cytoplasm and numerous nuclei in the cells, this condition is called as coenocytic. The cell wall is rigid and is made up of fungal cellulose and chitin.