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| Last Name | First Name | Dates | Confirmed | Volume Number | Page Number | Correspondence Information | Image | Other archives materials |
|---|---|---|---|---|---|---|---|---|
| MacGowan | Daniel Jerome | 1814-1893 | birth and death dates verified barnhart | 3 | 144 | no image | Historic Letters Collection; Photographic Archives; Personal Papers in Gray Archives | |
| Mackay | James Townsend | 1775-1862 | birth and death dates verified TL2 and Barnhart | 3 | 145 | 2 page letter from Dublin, Ireland, 9 November 1849 | no image | |
| Maclagan | Philip Whiteside | ? -1892 | birth and death dates verified Barnhart | 3 | 145 | 4 page letter from Montreal, Canada, 26 February 1852 | no image | Historic Letters Collection |
| Maclure | William | 1763-1840 | birth and death dates verified Barnhart | 3 | 145 | 2 page letter from Lancaster Road, PA 1799 | photo 2"x3" | |
| Macoun | John | 1831-1920 | birth and death dates verified TL2 | 3 | 147 | 2 page letter from Ottowa, Canada, 28 February 1884 | no image | Historic Letters Collection; Photographic Archives #0668, #0818, #1102, #1136 |
| MacOwan | Peter | 1830-1909 | birth and death dates verified TL2 | 3 | 147 | 2 page letter from Cape Town, South Africa, 11 November 1885 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #0974 |
| Macrae | William Frederick | ? -1874 | birth and death dates verified Barnhart | 3 | 148 | 3 page letter from Vermont, 23 August 1845 | no image | Historic Letters Collection |
| Magnus | Paul Wilhelm | 1844-1914 | birth and death dates verified TL2 | 4 | 149 | card from Berlin, Germany 1888 | no image | Historic Letters Collection |
| Malinvaud | Louis Jules Ernest | 1836-1913 | birth and death dates verified TL2 | 4 | 149 | 2 page letter from Paris, France, 27 October 1879 | no image | Historic Letters Collection |
| Malipighi | Marcello | 1627-1694 | birth and death dates verified Barnhart | 3 | 150 | 4 page letter from Bologna, Italy 1670 | sketch 8"x10" | |
| Maly | Josef Carl Gilbert | 1627-1694 | birth and death dates verified Barnhart | 3 | 150 | label | no image | |
| Mandon | Josef Carl Gilbert | 1799-1866 | birth and death dates verified Barnhart | 4 | 1 | 2 page letter from Poitiers, France, 10 September 1864 | no image | |
| Manetti | Giuseppe | 1831-1858 | birth and death dates verified TL2 | 4 | 2 | 1 page letter considered illegible by Jane Gray | no image | |
| Mann (Jr.) | Horace | 1844-1868 | birth and death dates verified TL2 | 4 | 2 | 4 page letter from San Francisco, CA 1864 | 2 photos (2 1/2"x4" & "2 1/2"x4") | Historic Letters Collection |
| Marcucci | Emilio | 1837-1890 | birth and death dates verified Barnhart | 4 | 3 | envelope from Florence, Italy | no image | |
| Marshall | Humphrey | 1722-1801 | birth and death dates verified TL2 | 4 | 3 | 1 page letter with signature from Chester County, Pennsylvania 1772 | no image | |
| Marshall | John | 1801-1873 | birth and death dates verified Barnhart | 4 | 3 | 4 page letter from London, England, 18 August 1858 | no image | |
| Martens | Martin | 1797-1863 | birth and death dates verified TL2 | 4 | 4 | Label (no dates) | no image | Historic Letters; Photographic Archives; Personal Papers in Gray Archives |
| Martin | William J. | no dates | birth and death dates unverified | 4 | 4 | 3 page letter from Chapel Hill, NC1861 | no image | |
| Martindale | Isaac Comley | 1842-1893 | birth and death dates verified TL2 | 4 | 5 | 1 page letter from Camden, NJ, 31 May 1885 | photo 4"x5" | Historic Letters Collection; Photographic Archives #0765 |
| Martins | Charles Frederic | 1806-1889 | birth and death dates verified | 4 | 5 | 3 page letter from Paris, France, 21 November 1837 | photo 2 1/2"x4" | Historic Letters Collection |
| Martius | Carl Friedrich Philipp von | 1794-1868 | birth and death dates verified TL2 | 4 | 6 | 2 page letter from Germany 1851; 2 page letter from Munich, Bavaria 1859 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #0972, 0973, 1356 map case |
| Masters | Maxwell Tylden | 1833-1907 | birth and death dates verified TL2 | 4 | 7 | 3 page letter from Isleworth, London, England, 13 November 1868 | photo 2 1/2"x4" | Historic Letters; Photographic Archives #0766 |
| Matthews | Washington, M.D. | 1843-1905 | birth and death dates verified Barnhart | 4 | 7 | 1 page letter from Camp Independence in CA, 25 July 1877 | no image | Historic Letters Collection |
| Maw | George | 1832-1912 | birth and death dates verified TL2 | 4 | 8 | 4 page letter from Benthall Hall near Dorseley, England, 6 September 1878 | no image | |
| Mawu | Ernesto | 1791-1836 | birth and death dates unverified | 4 | 8 | 2 page list of plants from the Botanical Garden of Rome, Italy | no image | |
| Maximowicz | Carl Johann | 1827-1891 | birth and death dates verified TL2 | 4 | 9 | 1 page letter from St. Petersburg, Russia, 22 January 1879; wrote about plants in Japan and Manchuria | photo 2 1/2"x4" | Historic Letters Collection |
| McCarthy | Michael Gerald | 1858-1915 | birth and death dates verified TL2 | 3 | 143 | 2 page letter from Washington, D.C., 5 April 1886 | no image | Historic Letter Collection |
| McCulloh | Richard | no dates | birth and death dates unverified | 3 | 143 | 4 page letter from Columbia College, New York, NY, 6 October 1856 | no image | |
| McCulloh | Thomas | no dates | birth and death dates unverified | 3 | 144 | 2 page letter from Halifax, Nova Scotia, 1 March (no year) | no image | |
| McNab | James | 1810-1878 | birth and death dates verified Barnhart | 3 | 146 | 2 page letter from Edinburgh, Scotland, 17 January 1834 | no image | |
| McNab | William Ramsay, M.D. | 1844-1889 | birth and death dates verified TL2 and Barnhart | 3 | 146 | 2 page letter from Dublin, Ireland, 16 January 1877 | no image | |
| Mead | Samuel Barnum | 1798-1880 | birth and death dates verified TL2 | 4 | 9 | 1 page letter from Augusta, Illinois, 29 November 1841; label; wrote about botany of Illinois | no image | Historic Letters Collection; Photographic Archives #1064 |
| Medikus | Friedrich Kasimir | 1736-1808 | birth and death dates verified TL2 | 4 | 10 | 4 page letter from Mannheim, Baden 1776 | no image | Photographic Archives #0502 |
| Meehan | Thomas | 1826-1901 | birth and death dates verified TL2 | 4 | 10 | 2 page letter from Germantown, PA, 29 July 1880 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #0657 |
| Meisner | Carl Friedrich, M.D. | 1800-1874 | birth and death dates verified TL2 | 4 | 11 | 3 page letter from Basel, Switzerland, 15 July 1847 | photo 2 1/2"x4" | Historic Letters Collection |
| Mellichamp | Joseph Hinson, M.D. | 1829-1908 | birth and death dates verified Barnhart | 4 | 11 | 4 page letter from Bluffton, South Carolina, 17 February 1885 | no image | Historic Letters Collection |
| Menzies | Archibald | 1754-1842 | birth and death dates verified | 4 | 12 | 2 page letter from Notting Hill, London, England, 13 August 1840 | photo 4"x5" | Historic Letters Collection |
| Merat de Vaumartoise | Francois Victor | 1780-1851 | birth and death dates verified TL2 | 4 | 12 | 1 page letter from Paris, France, 9 September 1828 | no image | |
| Mercier | Marie Philippe | 1781-1831 | birth and death dates verified | 4 | 13 | 1 page letter from Geneva, Switzerland (no dates) | no image | |
| Mertens | Franz Carl | 1764-1831 | birth and death dates verified TL2 | 4 | 13 | 3 page letter from Bremen, Germany, 18 May 1816 | no image | Historic Letters Collection |
| Mettenius | George Heinrich | 1823-1866 | birth and death dates verified TL2 | 4 | 14 | 3 page letter from Leipzig, Saxony, 24 February 1860 | photo 2 1/2"x4" | |
| Meyen | Franz Julius Ferdinand | 1804-1840 | birth and death dates verified TL2 | 4 | 15 | 1 page letter from Berlin, 17 May (no year given) | no image | |
| Meyer | Albert | no dates | birth and death dates verified TL2 | 4 | 16 | 1 page letter from Fort Duncan, Texas, June 1856 | no image | |
| Meyer | Carl Anton von | 1795-1855 | birth and death dates verified TL2 | 4 | 16 | 1 page letter from St. Petersburg, Russia, 13 April 1854 | no image | |
| Michaux | Andre | 1746-1803 | birth and death dates verified TL2 | 4 | 17 | 2 page letter from Charleston, South Carolina, 12 March 1791 | photo 3 1/2"x4 1/2" | Historic Letters Collection; Photographic Archives #0509 |
| Michaux | Francois Andre | 1770-1855 | birth and death dates verified TL2 | 4 | 19 | 3 page letter from Paris, France, 6 January 1851 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #0274, #0689, #0740, #0507, #0508 |
| Miers | John | 1789-1879 | birth and death dates verified TL2 | 4 | 20 | 1 page letter from Hammersmith, London, England, 21 February 1856 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #0535 |
| Miguel | Friedrich Anton Wilhelm | 1811-1871 | birth and death dates verified TL2 | 4 | 21 | 2 pages from Amsterdam, Holland 1843 | photo 2 1/2"x4" | Historic Letters Collection |
| Mikan | Joseph Gottfried | 1743-1814 | birth and death dates verified | 4 | 20 | 4 page letter with pencilling on the fourth page | no image | |
| Miller | Philip | 1691-1771 | birth and death dates verified TL2 | 4 | 21 | 2 page letter from Chelsea, England, 18 February 1756 regarding the gardener's diet | no image | |
| Mirbel | Charles Francois Brisseau de | 1776-1854 | birth and death dates verified TL2 | 4 | 111 | 1 page letter from Paris, France 1839 | sketch 6"x7" | Historic Letters Collection |
| Mitchell | John, M.D. | 1680-1772 | birth and death dates verified Barnhart | 4 | 23 | 2 page letter from London, England 1750 | no image | |
| Mitchell | Samuel Latham, M.D. | 1774-1831 | birth and death dates verified Barnhart | 4 | 24 | 1 page receipt (signature only), 7 September 1824 | no image | Historic Letters Collection; Photographic Archives #0505 |
| Mitten | William | 1819-1906 | birth and death dates verified TL2 | 4 | 24 | 2 page letter from Hurstpierpoint, England, 12 November 1868 | no image | Historic Letters Collection |
| Mivart | St. George | 1827-1900 | birth and death dates unverified | 4 | 25 | 1 page from London, England 1881 regarding 'nature and thought' | no image | |
| Miyabe | Kingo | 1860-1951 | birth and death dates verified TL2 | 4 | 25 | 2 page letter from Tokyo, Japan, 24 August 1893 regarding the flora of the Kurile Islands | photo 4"x4 1/2" | Historic Letters Collection; Photographic Archives #1054, #1540 |
| Moggridge | John Traherne | 1842-1874 | birth and death dates verified TL2 | 4 | 26 | 1 page letter from London, England, 9 October 1869 | photo 2 1/2"x4" | Historic Letters Collection |
| Mohl | Hugo von | 1805-1872 | birth and death dates verified TL2 | 4 | 26 | 1 page letter from Tubingen, Germany, 15 May 1857; card | photo 2 1/2"x4" | Photographic Archives #1359 map case |
| Mohr | Charles Theodore | 1824-1901 | birth and death dates verified TL2 | 4 | 27 | 2 page letter from Mobile, AL, 23 May 1886 regarding the forests of Alabama | no image | Historic Letters Collection; Photographic Archives #0794 |
| Molkenboer | Julianus Hendrik | 1816-1854 | birth and death dates verified TL2 | 4 | 27 | 1 page letter from Leyden, Holland 1850 | no image | |
| Montagne | Jean Pierre Francois Camille | 1784-1866 | birth and death dates verified TL2 | 4 | 28 | 2 page letter from Paris, France 1848 | sketch 8"x10" | Historic Letters Collection |
| Moore | David | 1808-1879 | birth and death dates verified TL2 | 4 | 28 | 1 page letter from Dublin, Ireland, 10 November, 1849 | no image | |
| Moore | Thomas | 1821-1887 | birth and death dates verified TL2 | 4 | 29 | 4 page letter from Chelsea, London, England, August 1857 | no image | Historic Letters Collection |
| Moquin-Tandon | Christian Horace Benedict Alfred | 1804-1863 | birth and death dates verified TL2 | 4 | 29 | 3 page letter from Paris, France, 3 May (no year) | no image | |
| Moretti | Giuseppe | 1782-1853 | birth and death dates verified TL2 | 4 | 30 | 1 page letter from Pavia, Italy, 31 March 1822 | no image | |
| Moricand | Moise Etienne (called Stefano) | 1779-1854 | birth and death dates verified TL2 | 4 | 113 | 1 page letter from Geneva, Switzerland 1850 | no image | |
| Moriere | Pierre Gilles (called Jules) | 1817-1888 | birth and death dates verified TL2 | 4 | 113 | 3 page letter from Caen, France, 19 January 1877 | no image | |
| Moris | Giuseppe Giacinto | 1796-1869 | birth and death dates verified TL2 | 4 | 32 | 1 page letter from Turin, Italy, 10 January 1835 | no image | Historic Letters Collection |
| Morong | Thomas | 1827-1840 | birth and death dates verified TL2 | 4 | 32 | 4 page letter from Ashland, MA, 21 May 1886 | no image | Historic Letters Collection; Photographic Archives #0654, #1059, #1091 |
| Morren | Charles Jacques Edouard | 1833-1886 | birth and death dates verified TL2 | 4 | 33 | 1 page letter from Liege, Belgium, 1877 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #1414 map case |
| Morris | Daniel | 1844-1933 | birth and death dates verified TL2 | 4 | 33 | 3 page letter from Kew, England, 11 July 1887 | no image | Historic Letters Collection |
| Morrow | James, M.D. | 1820-1865 | birth and death dates verified Barnhart | 4 | 34 | 3 page letter from Rudeaux, Abbeville, South Carolina, 6 November 1855 | no image | Historic Letters Collection |
| Morton | Samuel George | 1799-1851 | birth and death dates verified Barnhart | 4 | 35 | 2 page letter from Philadelphia, PA | photo 4.5"x5.5" | Historic Letters Collection |
| Mosely | Henry Nottidge | 1844-1890 | birth and death dates verified TL2 | 4 | 36 | 1 page letter from Montreal, Canada, 26 August 1884 | no image | Historic Letters Collection |
| Mougeot | jean Baptiste | 1776-1858 | birth and death dates verified TL2 | 4 | 37 | 3 page letter from France, 17 December 1813 | no image | |
| Mueller | Ferdinand Jacob Heinrich | 1825-1896 | birth and death dates verified TL2 | 4 | 38 | 4 page letter from Melbourne, Victoria in Australia, 17 January 1860 | photo 2 1/2"x4" | Historic Letters Collection; Photographic Archives #1360 map case |
| Muhlenberg | Gotthilf Henry Ernest | 1753-1815 | birth and death dates verified TL2 | 4 | 39 | 3 page letter from Lancaster, PA, 7 February 1809 | sketch 3"x3 1/2" | Historic Letters Collection |
| Muir | John | 1838-1914 | birth and death dates verified Barnhart | 4 | 40 | 1 page letter from CA, 26 February (no year) | no image | Historic Letters Collection |
| Muller | Heinrich Ludwig Hermann | 1829-1883 | birth and death dates verified TL2 | 4 | 38 | Photograph only | photo 21/2"x4" | |
| Muller | Jean | 1828-1896 | birth and death dates verified Barnhart | 4 | 38 | 3 page letter from Geneva, Switzerland, 2 October 1885 | photo 2 1/2"x4" | |
| Munroe | William | 1818-1880 | birth and death dates verified TL2 | 4 | 40 | 4 pages from Taunton, England, 7 February 1879 | photo 3 1/2"x4 1/2" | Historic Letters Collection; Photographic Archives #0277 |
| Murray | Andrew | 1812-1878 | birth and death dates verified TL2 | 4 | 41 | 3 page letter from Kensington, London, England, 8 February 1867 | no image | Historic Letters Collection |
| Murray | George Robert Milne | 1858-1911 | birth and death dates verified TL2 | 4 | 41 | 3 page letter from London, England, 26 July 1895 | no image | Historic Letters Collection |
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