What are the two types of mycelium?

What are the two types of mycelium?

• A. Septate hyphae
• B. Coenocytic hyphae
• C. Septate hyphae and coenocytic hyphae
• D. Aerial hyphae

Answer: (C)

Hyphal organization determines how a fungal mycelium is built. The two main forms are septate hyphae and coenocytic hyphae. Septate hyphae have internal cross walls, called septa, that divide the filament into distinct compartments. Each compartment contains nuclei and cytoplasm, and pores in the septa allow selective movement of nuclei, organelles, and nutrients between compartments. This structure creates a threaded, cellular-style network where damage or resource allocation can be localized to individual cells. Coenocytic hyphae, by contrast, lack septa entirely. They form long, continuous tubes of cytoplasm with many nuclei distributed throughout. Without walls, materials can move quickly along the hypha, which can support rapid growth and transport, but injury isn’t confined to a single cell since there are no cross walls to contain it. Aerial hyphae are a different feature to consider—they’re hyphae that extend above the substrate to release spores, not a separate category of mycelial type. So the two fundamental forms that describe the main mycelial architecture are septate hyphae and coenocytic hyphae.

Hyphal organization determines how a fungal mycelium is built. The two main forms are septate hyphae and coenocytic hyphae. Septate hyphae have internal cross walls, called septa, that divide the filament into distinct compartments. Each compartment contains nuclei and cytoplasm, and pores in the septa allow selective movement of nuclei, organelles, and nutrients between compartments. This structure creates a threaded, cellular-style network where damage or resource allocation can be localized to individual cells.

Coenocytic hyphae, by contrast, lack septa entirely. They form long, continuous tubes of cytoplasm with many nuclei distributed throughout. Without walls, materials can move quickly along the hypha, which can support rapid growth and transport, but injury isn’t confined to a single cell since there are no cross walls to contain it.

Aerial hyphae are a different feature to consider—they’re hyphae that extend above the substrate to release spores, not a separate category of mycelial type. So the two fundamental forms that describe the main mycelial architecture are septate hyphae and coenocytic hyphae.