Members of the class Phycomycetes (lower fungi) are primarily characterized by their diverse nutritional modes and habitats. According to the standard biological classification (NCERT), they are most commonly found in:

• Aquatic habitats and moist/damp places.

• Obligate saprophytes: They often live on decaying organic matter such as decaying wood in moist environments.

• Obligate parasites: Some members, such as Albugo (which causes white rust on mustard), must live on a host to survive.