Septate versus Coenocytic Hyphae
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Septate hyphae divide into cells by perforated cross-walls called septa; coenocytic hyphae lack septa, forming one large cell with many nuclei.
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Bread mold hyphae, in Zygomycota, are coenocytic, while most other fungal phyla divide their hyphae with perforated septa.
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Perforated septa let molecules stream between cells — a septate hypha is divided, but not sealed, cell to cell.