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SUMMARY: In ultra thin sections of hyphae of the yeast species Endomycopsis platypodis and E. monospora septal pores were observed with the electron microscope. The pores are enclosed by a swelling of the cross-wall. Electron-dense bodies plug the pores; these bodies are surrounded by a membrane which is connected with the endoplasmic reticulum and which also connects the plugs at both sides of the cross-wall via the pore.