[Electron microscopic structure of the Oidium, Oospora fragrans, a producer of lipase]

The fungus Oospora fragrans Berkh. was studied by electron microscopy. Both aerial and submerged oidia were found to be formed by division (septation) of mycelial hyphae in the course of growth. The ultrastructure of the aerial and submerged oidia was identical as was established by the techniques of ultratomy and freezing-etching. The latter technique revealed a certain difference in the morphology of the cytoplasmic membrane of these cells. The oidia of this fungus (arthrospores) differed in their structure from the arthrospores of actinomycetes.