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Biagio Longo (Laino Borgo, 4 February 1872 – Rome, 29 November 1950) was an Italian botanist.

Biography
Born to Luigi and Caterina Caputo, he got Maturità Classica in Cosenza, at Liceo Telesio. A scolarship allowed him to enrol in Università di Roma, where he graduated in natural sciences in 1895. He was appointed assistant professor to Pietro Romualdo Pirrotta, at Istituto Botanico of Rome. Later on, thanks to his dissertation Storia naturale delle droghe medicinali he qualified as a university teacher. From 1906 to 1915, he taught botany at University of Siena, where he founded the Botanic Institute and reorganised its Botanic Garden. In 1975, a plaque was affixed there to honour him. In 1913, he married the naturalist Beatrice Armari. In 1908, they got a son, named Luigi, who became a chemistry professor and director of the Istituto di Patologia del libro in Rome. In 1915, he moved to University of Pisa, where he was the dean of faculty of science from 1926 to 1929. In 1925 he declined the botany teaching post he was offered at University of Rome, In 1929, he was appointed director of the Istituto botanico e della stazione sperimentale per le piante officinali in Napoli. He was the president of the Società toscana di scienze naturali from 1929 to 1930. From 1930 to 1947 he was the director of Orto Botanico di Napoli. He retired in 1942 and moved to Rome in 1948, where he passed away two years later. A street in Rome got named after him.

Botany studies
Calabrian flora and Central and Southern Italy flora were the focus of his early studies. He painstakingly explored the river Lao valley and the Sila, and Campania, Basilicata, Abruzzo, Toscana. Accurate anatomical observations regarding the Pino Loricato of Pollino e of the Montea, that in Italy can be found only in Calabria and in Basilicata but is typical of Balcans were made, leading to the conclusion that the Pino Loricato didn't belong to the Pino silano species (Pinus laricio Poir.), quite common in Sicily and in Calabrian Apennines.