Displaying 1 - 75 out of 1736 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | A. B. Seymour s.n. | 02 Sep 1884 | United States of America | — | Medera. Dak. | — | 1553655 |
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| Achnatherum hymenoides (Roem. & Schult.) Barkworth | A. B. Seymour s.n. | 02 Sep 1884 | United States of America | Washington | Medora, Dak. | — | 1553656 |
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| Aecidium crotonopsidis Burrill | A. B. Seymour | May 1882 | United States of America | Illinois | Sanborn | probable isotype | 611029 |
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| Aecidium crotonopsidis Burrill | A. B. Seymour | May 1882 | United States of America | Illinois | Sanborn | probable isotype | 611030 |
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| Aecidium crotonopsidis Burrill | A. B. Seymour | May 1882 | United States of America | Illinois | Sanborn | probable isotype | 611031 |
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| Aecidium crotonopsidis Burrill | A. B. Seymour 4662 | 13 May 1882 | United States of America | Illinois | Johnson | probable isotype | 611032 |
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| Aecidium crotonopsidis Burrill | A. B. Seymour | 16 May 1882 | United States of America | Illinois | Sanborn | probable isotype | 611033 |
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| Aecidium diodiae Burrill | A. B. Seymour 4661 | 13 May 1882 | United States of America | Illinois | Johnson | syntype | 611056 |
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| Aecidium myosotidis Burrill | A. B. Seymour | Apr 1882 | United States of America | Illinois | Cobden. | isotype | 611234 |
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| Aecidium onobrychidis Burrill | A. B. Seymour | Jun 1882 | United States of America | Illinois | Seneca | isotype | 611250 |
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| Aecidium onobrychidis Burrill | A. B. Seymour | Jun 1882 | United States of America | Illinois | Seneca | isotype | 611251 |
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| Aecidium onobrychidis Burrill | A. B. Seymour 5249 | 20 Jun 1882 | United States of America | Illinois | La Salle | isotype | 611252 |
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| Aecidium onobrychidis Burrill | A. B. Seymour 5249 | 20 Jun 1882 | United States of America | Illinois | La Salle | isotype | 611253 |
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| Aecidium onobrychidis Burrill | A. B. Seymour | Jun 1882 | United States of America | Illinois | Seneca | isotype | 611254 |
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| Agarum | A. B. Seymour s.n. | 08 Jan 1921 | United States of America | Massachusetts | Suffolk Co. Revere Beach | — | 3207729 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. B. Seymour s.n. | 02 Jul 1908 | United States of America | Massachusetts | Middlesex Co. Near Fresh Pond,… | — | 1555739 |
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| Agrostis hyemalis (Walter) Britton, Sterns & Poggenb. | A. B. Seymour s.n. | 08 Sep 1884 | United States of America | Montana | Bozeman | — | 1556182 |
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| Agrostis perennans (Walter) Tuck. | A. B. Seymour s.n. | 19 Aug 1891 | United States of America | North Carolina | Asheville | — | 1556694 |
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| Agrostis perennans (Walter) Tuck. | A. B. Seymour s.n. | 19 Aug 1891 | United States of America | North Carolina | Asheville | — | 1556972 |
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| Agrostis scabra Willd. | A. B. Seymour s.n. | 06 Sep 1884 | United States of America | Montana | Livingston | — | 1532891 |
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| Ahnfeltia plicata (Huds.) Fr. | A. B. Seymour s.n. | 10 Aug 1883 | United States of America | Rhode Island | Block Island | — | 2142044 |
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| Ahnfeltia plicata (Huds.) Fr. | A. B. Seymour s.n. | 10 Aug 1883 | United States of America | Rhode Island | Block Island | — | 2142147 |
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| Ahnfeltia plicata (Huds.) Fr. | A. B. Seymour s.n. | 12 Jul 1917 | United States of America | Massachusetts | Suffolk Co. washed ashore | — | 3559211 |
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| Ahnfeltia plicata (Huds.) Fr. | A. B. Seymour s.n. | Jan 1894 | United States of America | Massachusetts | Essex Co. Nahant | — | 3559217 |
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| Albugo bliti (Biv.) J.E.Kuntze | A. B. Seymour s.n. | 25 Aug 1885 | United States of America | Delaware | New Castle Co. Faulkland | — | 2759806 |
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| Albugo bliti (Biv.) J.E.Kuntze | A. B. Seymour s.n. | July 19, 1889 | United States of America | Massachusetts | Hampden Co. Southwick | — | 2759844 |
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| Albugo bliti (Biv.) J.E.Kuntze | A. B. Seymour s.n. | 29 Aug 1905 | United States of America | Massachusetts | Middlesex Co. Waverly | — | 2759862 |
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| Albugo bliti (Biv.) J.E.Kuntze | A. B. Seymour s.n. | 19 Jul 1889 | United States of America | Massachusetts | Hampden Co. Southwick | — | 2759900 |
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| Albugo bliti (Biv.) J.E.Kuntze | A. B. Seymour s.n. | 19 Jul 1889 | United States of America | Massachusetts | Hampden Co. Southwick | — | 2771003 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Jul 1883 | United States of America | Massachusetts | Middlesex Co. Concord | — | 2771079 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Aug 1895 | United States of America | Massachusetts | Middlesex Co. Belmont. | — | 2771086 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Jul 1883 | United States of America | Massachusetts | Middlesex Co. Concord | — | 2771088 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | May 1880 | United States of America | Illinois | Champaign Co. Urbana. | — | 2771277 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Aug 1895 | United States of America | Massachusetts | Middlesex Co. Belmont. | — | 2771293 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Aug 1895 | United States of America | Massachusetts | Middlesex Co. Belmont. | — | 2771296 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | May 1880 | United States of America | Illinois | Champaign Co. Urbana. | — | 2771348 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 02 Jul 1908 | United States of America | Massachusetts | Middlesex Co. Waverley. | — | 2771380 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 03 Aug 1895 | United States of America | Massachusetts | Middlesex Co. Belmont | — | 2771517 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | 29 May 1880 | United States of America | Illinois | Champaign Co. Urbana. | — | 2771557 |
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| Albugo candida (Pers.) Roussel | A. B. Seymour s.n. | May 1880 | United States of America | Illinois | Champaign Co. Urbana. | — | 2771558 |
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| Albugo cubicus | A. B. Seymour 1535 | 01 Sep 1890 | United States of America | Delaware | New Castle Co. Wilmington. | — | 2771750 |
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| Albugo cubicus | A. B. Seymour s.n. | 13 Aug 1883 | United States of America | Massachusetts | Granville | — | 2771760 |
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| Albugo cubicus | A. B. Seymour s.n. | 12 Aug 1885 | United States of America | Massachusetts | Granville | — | 2771761 |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | A. B. Seymour s.n. | 15 Jul 1891 | United States of America | Virginia | Hampton | — | 2771823 |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | A. B. Seymour 334 a. | 12 Jul 1891 | United States of America | Virginia | Hampton | — | 2771856 |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | A. B. Seymour s.n. | 15 Jul 1891 | United States of America | Virginia | Hampton | — | 2771868 |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | A. B. Seymour s.n. | 04 Sep 1880 | United States of America | Illinois | Adams Co. Quincy. | — | 2771896 |
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| Albugo tragopogonis (Pers.) Gray | A. B. Seymour s.n. | 13 Aug 1883 | United States of America | Massachusetts | Hampden Co. Granville | — | 2767289 |
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| Albugo tragopogonis (Pers.) Gray | A. B. Seymour s.n. | 13 Aug 1883 | United States of America | Massachusetts | Hampden Co. Granville. | — | 2767333 |
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| Alectoria jubata var. chalybeiformis (L.) Ach. | A. B. Seymour s.n. | 27 Jul 1891 | United States of America | Virginia | Wise Co. Norton, Cumberland Mts. | — | 4440202 |
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| Alopecurus geniculatus L. | A. B. Seymour s.n. | 22 Aug 1884 | United States of America | Minnesota | Brainerd | — | 1638005 |
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| Alopecurus pratensis L. | A. B. Seymour s.n. | Jun 1891 | United States of America | Massachusetts | Middlesex Co. Cambridge | — | 1638374 |
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| Alopecurus pratensis L. | A. B. Seymour s.n. | Jun 1891 | United States of America | Massachusetts | Middlesex Co. Cambridge | — | 1638375 |
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| Ammophila breviligulata Fernald | A. B. Seymour 130 | 28 Aug 1908 | United States of America | Massachusetts | Suffolk Co. Points of Pines,… | — | 1638579 |
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| Ammophila breviligulata Fernald | A. B. Seymour 130 | 28 Aug 1908 | United States of America | Massachusetts | Suffolk Co. Point of Pines,… | — | 1638584 |
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| Andropogon gerardii Vitman | A. B. Seymour 3634 | 23 Aug 1878 | United States of America | Illinois | [Camp] Point | — | 1639235 |
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| Ankistrodesmus falcatus (Corda) Ralfs | A. B. Seymour s.n. | Mar 1916 | United States of America | Massachusetts | Middlesex Co. in a culture | — | 2016504 |
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| Ankistrodesmus falcatus var. duplex (Kütz.) G.S.West | A. B. Seymour s.n. | Mar 1916 | United States of America | Massachusetts | Middlesex Co. in a culture | — | 2344122 |
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| Antennularia quercina (Pers.) E.Müll. | A. B. Seymour s.n. | s.d. | — | — | — | 2989743 |
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| Anthracobia melaloma Alb. & Schwein. | A. B. Seymour s.n. | Oct 1907 | United States of America | Massachusetts | Purgatory Swamp, Norwood | — | 3429768 |
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| Antithamnion | A. B. Seymour s.n. | 11 Sep 1905 - 21 Sep 1905 | United States of America | Massachusetts | Barnstable Co. Woods Hole | — | 3559485 |
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| Apiosporina collinsii (Schwein.) Höhn. | A. B. Seymour s.n. | 28 Jul 1890 | United States of America | Massachusetts | Pigeon Cove | — | 2989812 |
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| Apiosporina collinsii (Schwein.) Höhn. | A. B. Seymour s.n. | 18 Jun 1900 | United States of America | Massachusetts | Woods Hole | — | 2989828 |
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| Apiosporina collinsii (Schwein.) Höhn. | A. B. Seymour s.n. | 28 Jul 1890 | United States of America | Massachusetts | Pigeon Cove | — | 2989831 |
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| Apiosporina collinsii (Schwein.) Höhn. | A. B. Seymour s.n. | 28 Jul 1890 | United States of America | Massachusetts | Pigeon Cove | — | 2989832 |
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| Apiosporina collinsii (Schwein.) Höhn. | A. B. Seymour s.n. | 28 Jul 1890 | United States of America | Massachusetts | Pigeon Cove | — | 2989847 |
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| Aralia racemosa L. | A. B. Seymour s.n. | Aug 1889 | United States of America | Massachusetts | Hampden Co. | — | 2558267 |
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| Aristida longespica Poir. | A. B. Seymour 128 | 04 Sep 1908 | United States of America | Massachusetts | Norfolk Co. Randolph Avenue | — | 1474593 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | 24 Apr 1882 | United States of America | Illinois | Union Co. Prope Pine Hills | — | 3014653 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | 11 Jun 1880 | United States of America | Illinois | Urbana | — | 3014658 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | May 1829 | United States of America | Illinois | Urbana | — | 3014661 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | 31 May 1881 | United States of America | Illinois | Champaign Co. | — | 3014668 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | 20 Jun 1888 | United States of America | New Hampshire | Temple | — | 3014712 |
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| Arthuriomyces peckianus (Howe) Cummins & Y.Hirats. | A. B. Seymour s.n. | 20 Jun 1888 | United States of America | New Hampshire | Temple | — | 3014713 |
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| Ascomycetella Sacc. | A. B. Seymour s.n. | 24 Sep 1891 | United States of America | — | Holly Springs, Miss. | — | 2978750 |
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