The important characteristics of fungi are as follows :
(1) With the exception of yeasts which are unicellular, fungi are filamentous. Their bodies consist of long, slender thread-like structures called hyphae.
(2) Some hyphae are continuous tubes filled with multinucleated cytoplasm-these are called coenocytic hyphae.
(3) There may be holes in the septa of some fungal hyphae, through which this the cytoplasm can flow freely.
(4) The network of hyphae is known as mycelium. Their cell wall is made of chitin and polysaccharides.
(5) Mycelia may be spread at the subsurface or on the ground. So much so that they extend for many kilometres.
(6) Both asexual and sexual types of reproduction occur in fungi.
(7) Most fungi are heterotrophic and absorb soluble organic matter from dead substrates and hence are called saprophytes. Those that depends on living plants and animals are called parasites. They can also live as symbionts-in association with algae as lichens and with roots of higher plants as mycorrhiza.