1. Unicellular: Fungi that are made up of a single cell are called unicellular fungi. They are known as yeast. They are holocarpic fungi. Their whole body turns into genitals. Such as Saccharomyces, Synchytrium, Physarum.
2. Pseudomycelium: Any fungus that produces buds. The buds do not separate and form spiral structures. This is called pseudomycelium. For example – Saccharomyces.
3. Filamentus: The mycelium of multicellular fungi is linear and branched. They are composed of slender and linear hyphae or filaments. Hyphae join together to form mycelium. Mycelium may be septate or septate or non-septate. Mycelium which has septa or walls is called septate. Penicillium and Agaricus are acinocytic. The mycelium that does not have septa or walls is called sinocytic mycelium. Cells of sinusocytic mycelium contain multiple nuclei. This is called sinusitis. Mucor and Saprolegnia are acinocytic.
4. Rhizoid: The mycelium of multicellular fungi produces food-absorbing rhizoids or haustoria. It is called rhizomycelium. It absorbs food from the environment. Eg – Rhizopodium, Rhizopus, Agaricus etc.
5. Prosenchyma: Small, spherical and multinucleated cell structure of fungi is called Prosenchyma.
6. Rhizomorph: When the mycelium of the fungus is joined together to form a thick and strong rope-like organ, it is called rhizomorph. The rhizomorph germinates in a favorable environment to form new mycelium. Like Agaricus, Alternaria etc.
7. Sclerotium: When the hyphae of the fungus intertwine and form a round or cylindrical hard and complex structure, it is called sclerotium. eg Agaricus.
8. Mycorrhiza: If the mycelium forms a net-like structure, it is called mycorrhizal fungi. Such fungal mycorrhizae are called mycorrhizae. Like Amanita, Saprolegnia etc.