Displaying 776 - 825 out of 919 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Pyrenula pseudobufonia (Rehm) R.C.Harris | T. A. Williams | Dec 1896 | United States of America | Maryland | Montgomery Co. Takoma Park | — | 1396656 |
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| Biatora icterica Mont. | T. A. Williams s.n. | 06 Jan 1896 | United States of America | Nebraska | Lancaster Co. | — | 04440030 |
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| Corallorhiza ochroleuca Rydb. | T. A. Williams 48 | 24 Jun 1890 | United States of America | Nebraska | War Bonnet Canyon | holotype | 8673 |
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| Corallorhiza ochroleuca Rydb. | T. A. Williams 48 | 24 Jun 1890 | United States of America | Nebraska | War Bonnet Canyon | isotype | 8674 |
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| Phyllactinia guttata (Wallr.:Fr.) Lév. | T. A. Williams s.n. | 15 Sep 1898 | United States of America | Montana | Missoula | — | 2943003 |
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| Phyllactinia guttata (Wallr.:Fr.) Lév. | T. A. Williams s.n. | 9/10 1898 | United States of America | Montana | Missoula | — | 2943002 |
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| Ceratophorum ulmicola Ellis & Kellerm. | T. A. Williams 9 | Sep 1889 | United States of America | Nebraska | Ashland | — | 04504271 | ||
| Ceratophorum ulmicola Ellis & Kellerm. | T. A. Williams 9 | 02 Oct 1889 | United States of America | Nebraska | Ashland | — | 04504270 | ||
| Phyllactinia guttata (Wallr.:Fr.) Lév. | T. A. Williams s.n. | 9/12 1898 | United States of America | Montana | Missoula | — | 2943001 |
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| Elymus glaucus Buckley | T. A. Williams 209 | 25 Aug 1898 | United States of America | Wyoming | S. Fork of Piney Creek. | — | 1673902 |
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| Microsphaera symphoricarpi Howe | T. A. Williams s.n. | 09 Sep 1898 | United States of America | — | Missoula Mout. | — | 2942344 |
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| Pellaea atropurpurea (L.) Link | T. A. Williams s.n. | 16 Aug 1891 | United States of America | — | Dakota. Raford city. | — | 3495632 |
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| Uromyces junci-effusi P.Syd. & Syd. | T. A. Williams s.n. | 26 Mar 1891 | United States of America | — | Dakota Flora. [Illegible precise loc.] | — | 3622345 |
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| Achnatherum richardsonii (Link) Barkworth | T. A. Williams 26761/2 | 25 Jul 1897 | United States of America | Wyoming | Welcome | — | 1553848 |
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| Apiosporina collinsii (Schwein.) Höhn. | T. A. Williams s.n. | 26 Jul 1897 | United States of America | Wyoming | Welcome | — | 2989764 |
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| Xanthoparmelia lineola (E.C.Berry) Hale | T. A. Williams | Aug 1891 | United States of America | South Dakota | Pennington Co. Black Hills | — | 02686590 | ||
| Biatora schweinitzii Fr. ex Tuck. | T. A. Williams s.n. | Dec 1896 | United States of America | District of Columbia | Takoma Park. | — | 04440076 |
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| Cladonia delicata (Ehrh.) Flörke | T. A. Williams s.n. | 01 May 1897 | United States of America | District of Columbia | Rock Creek Park. | — | 4440506 |
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| Cladonia delicata (Ehrh.) Flörke | T. A. Williams s.n. | 01 May 1897 | United States of America | District of Columbia | Rock Creek Park. | — | 04440080 |
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| Biatora uliginosa (Schrad.) Fr. | T. A. Williams s.n. | May 1897 | United States of America | District of Columbia | Takoma Park. | — | 4440520 |
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| Arthonia quintaria Nyl. | T. A. Williams s.n. | Oct 1897 - Dec 1897 | United States of America | District of Columbia | Takoma Park. | — | 4440518 |
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| Cetraria aleurites var. placorodia Ach. | T. A. Williams s.n. | Mar 1898 | United States of America | District of Columbia | Rock Creek. | — | 4440525 |
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| Pertusaria pustulata (Ach.) Duby | T. A. Williams s.n. | Apr 1898 | United States of America | District of Columbia | Takoma Park. | — | 4440526 |
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| Ramalina calicaris var. fraxinea (L.) Fr. | T. A. Williams s.n. | 30 May 1898 | United States of America | District of Columbia | Rock Creek. | — | 4440537 |
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| Graphis dendritica Ach. | T. A. Williams s.n. | May 1898 | United States of America | District of Columbia | Takoma Park. | — | 4440531 |
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| Arthonia punctiformis Ach. | T. A. Williams s.n. | May 1898 | United States of America | District of Columbia | Takoma Park. | — | 4440535 |
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| Cladonia papillaria var. molariformis Nyl. | T. A. Williams s.n. | Dec 1898 | United States of America | District of Columbia | Rock Creek. | — | 4440558 |
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| Cladonia caespiticia (Pers.) Flörke | T. A. Williams s.n. | 11 Oct 1899 | United States of America | District of Columbia | Rock Creek, near Takoma Park. | — | 4440569 |
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| Biatora rubella (Hoffm.) Rabenh. | T. A. Williams s.n. | 26 Dec 1896 | United States of America | Maryland | Montgomery Co. Takoma Park. | — | 04440509 |
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| Biatora rubella (Hoffm.) Rabenh. | T. A. Williams s.n. | 26 Dec 1896 | United States of America | Maryland | Montgomery Co. Takoma Park. | — | 04440087 |
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| Cladonia gracilis var. verticillata (Hoffm.) Fr. | T. A. Williams s.n. | Dec 1896 | United States of America | Maryland | Montgomery Co. Takoma Park, Maryland. | — | 4440495 |
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| Pyrenula nitida (Weigel) Ach. | T. A. Williams s.n. | Dec 1896 | United States of America | Maryland | Montgomery Co. Takoma Park, Maryland. | — | 4440494 |
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| Cladonia mitrula Tuck. | T. A. Williams s.n. | Dec 1896 | United States of America | Maryland | Montgomery Co. Chevy Chase. | — | 04440075 |
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| Cetraria fendleri (Nyl.) Tuck. | T. A. Williams s.n. | Jan 1897 | United States of America | Maryland | Montgomery Co. Takoma Park. | — | 04440065 |
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| Collema ryssoleum (Tuck.) A.Schneid. | T. A. Williams s.n. | Jun 1897 | United States of America | Maryland | Montgomery Co. Sligo Creek. | — | 04440513 |
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| Collema ryssoleum (Tuck.) A.Schneid. | T. A. Williams s.n. | Jun 1897 | United States of America | Maryland | Montgomery Co. Sligo Creek. | — | 4440094 |
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| Pannaria leucosticta Tuck. | T. A. Williams s.n. | Dec 1897 | United States of America | Maryland | Montgomery Co. Sligo Creek. | — | 4440519 |
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| Pannaria molybdaea var. cronia (Tuck.) | T. A. Williams s.n. | Dec 1897 | United States of America | Maryland | Montgomery Co. Sligo Creek. | — | 4440521 |
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| Endocarpon arboreum Schwein. | T. A. Williams s.n. | May 1898 | United States of America | Maryland | Montgomery Co. Sligo Creek. | — | 4440533 |
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| Parmelia borreri var. rudecta (Ach.) Tuck. | T. A. Williams s.n. | Dec 1896 | United States of America | Maryland | Takoma Park. | — | 04440061 |
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| Lecanora hagenii (Ach.) Ach. | T. A. Williams s.n. | Jan 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440560 |
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| Arthonia dispersa (Schrad.) Nyl. | T. A. Williams s.n. | 16 Feb 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440458 |
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| Arthonia dispersa (Schrad.) Nyl. | T. A. Williams s.n. | 16 Feb 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 04440005 |
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| Arthonia dispersa (Schrad.) Nyl. | T. A. Williams s.n. | 16 Feb 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 1364414 |
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| Biatora varians (Ach.) Eschw. | T. A. Williams s.n. | 29 Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440472 |
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| Pyrenula cinerella (Nyl.) Branth & Rostr. | T. A. Williams s.n. | 29 Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440476 |
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| Pyrenula cinerella (Nyl.) Branth & Rostr. | T. A. Williams s.n. | 29 Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 04440025 |
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| Arthonia punctiformis Ach. | T. A. Williams s.n. | 29 Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 04440038 |
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| Arthonia punctiformis Ach. | T. A. Williams s.n. | 29 Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4584632 |
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| Lecanora effusa (Hoffm.) Ach. | T. A. Williams s.n. | Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 04440512 |
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