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In page Marianne Plehn:

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In Germany it was not possible for women to qualify as lecturers, thus Plehn was awarded the title royal professor in 1914 by King Ludwig III of Bavaria for her great contribution to fish pathology. This made her the first woman to be granted a professorship in Bavaria. But a teaching certificate was not linked to this, and it only became possible for women to acquire such qualification in 1919. Plehn did not seek such qualification. Instead she continued to focus on research at the Bavarian Biological Experimental Institute.[1]: 1032  In 1920 Plehn published reports on two skin and gill parasites, the Ichthyochytrium vulgare and the Mucophilus cyprini (later identified as a rickettsia[citation needed]).[2]: 118