Botanists, mycologists and zoologists from German-speaking countries. Approximately 79 letters, maps and manuscripts. 1838-1903. Mostly self-handed letters, mostly in German, usually to colleagues on topics of botany or mycology, often to Paul Sydow (1851-1925) in Berlin. As far as possible, besides the names and life dates, there are also number of pieces as well as place and year of writing: Andreas Allescher (1828-1903, 3 Briefe, München 1898-1899), Ferdinand Arnold (1828–1901, 7 Br., Eichstätt und München 1859-1887), Bernhard Auerswald (1818-1870, 1 Fragment), Hans Bachmann (1866-1940, 1 Billet), Carl Baenitz (1837-1913, 1 Br., Wroclaw 1898), Josef Barth (1833-1915, 1 Br., Langenthal, Transylvania, 1896), E. Baumgardt (1 Br. and Potsdam 1872), H. Becker (d. 1917, 1 Br., Grahamstown, South Africa, Cape Colony 1897), Jean Philippe Becker (1815-1889, 1 Br., Mülhausen, Alsace, 1868), Carl Bolle (1821-1909, 1Br., Berlin 1853), Frantisek Bubák (1866-1925, 4 Br.; 1 Karte, Hohenstadt and Prague, 1897-1900), Victor Carus (1823-1903, 3 Br.., Leipzig 1878), Emil Diettrich-Kalkhoff (1 B., Arco, South Tyrol, o. J.), A. W. Eichler (1839-1887, 1 Karte, Berlin 1881), B. Eichler (3 Br., Miedryzzec 1896-1899), Adolph Engler (1844-1930, 2 Br.; 1 Karten, 1 Pflanze, Wroclaw and Berlin 1864-1894), Johann Feltgen (1833-1904, 2 Br., Luxembourg 1901-1903), Eduard Fenzl (1808-1879, 2 Bru., Vienna 1857-1869), Franz Fiala (1861-1898, 1 Br. and Sarajevo 1894), A. Foscher von Waldheim (1 Br. , St. Petersburg 1898), Albert Bernhard Frank (1839-1900, 1 fragment Leipzig o. J.), W. Franzschel (3 Br., St. Petersburg 1891-1903), v. Freier (1 Br., Hoppenrade, Mark Brandenburg 1896), Hieronymus Gander (1832-1902, 1 Br. , Janervillgraten, Tirol, 1887), Johann Heinrich Robert Göppert (1800-1884, 1 B., Wroclaw 1871), Otto Jaap (1864-1922, 1 Bru., 1 Karte, Hamburg 1894-1898), J. F. by Jacquin d. J. (1 Br., Vienna 1838, with 1 copper engraving portrait N. J. von Jacquins, 1784), M. Kahn (1 Karte, Berlin 1882), Franz Kappel (1855-1909, 1 Br., Artern 1897), Karl von Keissler (1872-1965, 1 B., Vienna 1898), Dietrich Georg Kieser (1779-1862, 1 Bru., Jena 1862), Kiesler (1 Br.; Bitsch 1899), Heinrich Klebahn (1859-1942, 2 Br.: 2 Karten, Hamburg und Bremen 1894-1901), Georg Albrecht Klebs (1857-1918, 2 Br., Hall 1900-1901) Leopold Kny (1841-1916), 2 Br., Wilmersdorf bei Berlin 1900), Friedrich G. Kohl (1855-1910, 1 Br. and Marburg 1902), Wilhelm Körber (1817-1885, 1 B., Wroclaw 1856), Richard Kolkwitz (1873-1956, 2 Br.; 1 Karte, Charlottenburg bei Berliner 1903), Fridolin Krasser (1863-1923, 1 Bru., Vienna 1897), Christian Ferd. von Krauß (1812-1890, 1 Bri., Stuttgart c. 1866), Julius Kühn (1825-1910; 1 Br, Halle 1875), Paul Lindner (1861-1945, 2 ==References==
Adolf (?) Martin (1 map, Oldenburg 1871), Louis Osswald (1854-1918, 2 Br., Nordhausen 1898-1902), Ernst Adolf Sagorski (1847-1929, 2 B., Pforta 1892-1893), Carl Warnstorf (1837-1921, 1 map, Neuruppin 1898).