Gustav Niessl von Mayendorf

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Gustav Niessl von Mayendorf , also Mayendorff, Maiendorf, often cited as G. von Niessl, (born April 26, 1839 in Verona , † September 1, 1919 in Hütteldorf near Vienna ) was an Austrian astronomer and mycologist . His botanical-mycological author's abbreviation is " Niessl ".

Niessl was the son of an artillery officer, studied at the Polytechnic in Vienna and became an assistant for practical geometry at Herr in 1857 . In 1859 he held the chair for practical geometry at the Technical College in Brno , where he became a full professor in 1860 and later represented practical geometry, astronomy and higher geodesy . 1968/1869 he was its director. After this technical university became its rector in 1877/78 and 1888/89. In 1907 he retired (and received an honorary doctorate in the same year). In 1883 he became a councilor and in 1902 a royal court councilor. For several decades he was secretary of the Brno Society of Natural Sciences.

Niessl initially dealt with geodesy . As an astronomer Niessl dealt with meteor orbits and wrote the corresponding article in the Encyclopedia of Mathematical Sciences (1907). Niessl was also an important mushroom collector and mycologist, whose collection went to the Botanical State Collection in Munich. He was considered a connoisseur of the flora in Moravia and Silesia and had close contact with the researcher of the cryptogams Gottlob Ludwig Rabenhorst .

Two mushroom genera were named after him. He dealt in particular with microscopic hose fungi , slime molds and rust fungi , about which he also published.

From 1904 he was a corresponding member of the Austrian Academy of Sciences . He was a member of the Austrian Commission for International Geometric Surveying and the Patent Court.

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