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Gustav Niessl von Mayendorf (26 April 1839 in Verona – 1 September 1919 in Hütteldorf, Vienna; often cited as G. von Niessl), was an Austrian astronomer and mycologist. Niessl, the son of an artillery officer, studied at the Polytechnic in Vienna in 1857 and became assistant to practical geometry. In 1859 he took the chair of practical geometry at the Technical College in Brno, where he became a full professor in 1860 and later taught applied geometry, astronomy and higher geodesy. He became the director in 1868/1869. After this technical college, he was its rector in 1877/78 and 1888/89. In 1907 he retired (and in the same year received an honorary doctorate). For several decades he was secretary of the Natural Science Society in Brno. Niessl was first engaged in geodesy. As an astronomer, he was employed with Niessl meteor orbits and also wrote the article in the ''Enzyklopädie der mathematischen Wissenschaften'' (''Encyclopedia of Mathematical Sciences'') (1907). Niessl was also a significant mycologist and mushroom collector, whose collection at the Botanical State Collection Munich went. He was regarded as an expert in the flora of Moravia and Silesia, and had close contact with the botanist Gottlob Ludwig Rabenhorst. Two fungal species were named after him. He was particularly concerned with microscopic sac fungi, slime molds, and rusts. Since 1904, he was a corresponding member of the Austrian Academy of Sciences. He was a member of the Austrian Commission for International Geodesy and the Patent Court. ==References== *Th. R. Widorn: Niessl von Mayendorf (Maiendorf) Gustav . In: Österreichisches Biographisches Lexikon 1815–1950 (ÖBL). Band 7, Verlag der Österreichischen Akademie der Wissenschaften, Wien 1978, ISBN 3-7001-0187-2, S. 126 f. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gustav Niessl von Mayendorf」の詳細全文を読む スポンサード リンク
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