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With the exception of unicellular yeasts, fungi are generally filamentous. Their bodies consist of thread-like hyphae, and the network formed by these hyphae is called the mycelium.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Fungi - Phycomycetes Ascomycetes Basidiomycetes
Septate hyphae contain cross-walls called septa dividing filament into compartmentalized cells while retaining cytoplasmic continuity. Septa form via centripetal ingrowth of plasma membrane and wall, contain central pore allowing cytoplasmic continuity, organelle and nuclear migration regulated by Woronin bodies in ascomycetes sealing damage. This contrasts with aseptate coenocytic hyphae where nuclei share continuous cytoplasm without septa. Terminology septate hyphae describes presence of septa, not absence. Rhizoids are root-like anchoring hyphae in Rhizopus. Therefore hyphae possessing regular septation are termed septate, common in Ascomycota and Basidiomycota.
Ref: Campbell Biology 12th ed., Chapter 31: Hyphal Septation; NCERT Class 11 Fungi Hyphae Septa; NCBI Fungal Septal Structure - Woronin Bodies
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