Unicellular fungus takes food and grows in size and divides by fission process to produce two new fungi. E.g. Saccharomyces
Segmentation of fungi
The mycelium of multicellular fungi is divided into two or more segments by injury or physical causes. A new fungus develops from each segment. Such as Saprolegnia, Aspergillus, Rhizopus, Penicillium etc.