Displaying 801 - 850 out of 919 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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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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| Endocarpon | T. A. Williams s.n. | Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4585744 |
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| Omphalaria pulvinata (Schaer.) Nyl. | T. A. Williams s.n. | Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 04440033 |
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| Lichinella cribellifera (Nyl.) P.P.Moreno & Egea | T. A. Williams s.n. | Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 1399142 |
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| Lecanora effusa (Hoffm.) Ach. | T. A. Williams s.n. | Nov 1895 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440093 |
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| Rinodina sophodes var. exigua (Ach.) Tuck. | T. A. Williams s.n. | Jan 1896 | United States of America | Nebraska | Cass Co. Weeping Water. | — | 4440496 |
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| Biatora icterica Mont. | T. A. Williams s.n. | 06 Jan 1896 | United States of America | Nebraska | Lancaster Co. Lincoln. | — | 4440479 |
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| Endocarpon rufescens Ach. | T. A. Williams s.n. | Jan 1896 | United States of America | Nebraska | Lancaster Co. Lincoln. | — | 4440480 |
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| Lecanora fuscata var. peliscypha | T. A. Williams s.n. | Jan 1896 | United States of America | Nebraska | Lancaster Co. Lincoln. | — | 04440055 |
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| Teloschistes concolor var. effusa Tuck. | T. A. Williams s.n. | 14 Nov 1895 | United States of America | Nebraska | Saunders Co. Ashland. | — | 4440562 |
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| Parmelia molliuscula Ach. | T. A. Williams s.n. | 20 Jun 1890 | United States of America | Nebraska | Near War Bonnet Canon, northwest… | — | 4440261 |
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| Parmelia molliuscula Ach. | T. A. Williams s.n. | 20 Jun 1893 | United States of America | Nebraska | Near War Bonnet Canon, northwest… | — | 4440381 |
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| Opegrapha varia Pers. | T. A. Williams s.n. | 16 Apr 1891 | United States of America | South Dakota | Brookings Co. Brookings. | — | 04440002 |
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| Opegrapha varia Pers. | T. A. Williams s.n. | Apr 1895 | United States of America | South Dakota | Brookings Co. Brookings. | — | 4440456 |
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| Parmelia borreri (Sm.) Turner | T. A. Williams s.n. | Apr 1895 | United States of America | South Dakota | Brookings Co. Brookings. | — | 04440438 |
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| Rinodina sophodes var. exigua (Ach.) Tuck. | T. A. Williams s.n. | Apr 1895 | United States of America | South Dakota | Brookings Co. Brookings. | — | 04439996 |
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| Teloschistes concolor var. effusa Tuck. | T. A. Williams s.n. | Apr 1895 | United States of America | South Dakota | Brookings Co. Brookings. | — | 04440066 |
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| Ramalina pollinaria (Westr.) Ach. | T. A. Williams s.n. | Sep 1894 | United States of America | South Dakota | Minnehaha Co. Dell Rapids. | — | 04439979 |
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| Ramalina pollinariella (Nyl.) Nyl. | T. A. Williams s.n. | Sep 1894 | United States of America | South Dakota | Minnehaha Co. Dell Rapids. | — | 04439978 |
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| Solorina saccata (L.) Ach. | T. A. Williams s.n. | Aug 1891 | United States of America | South Dakota | Pennington Co. Rapid City. | — | 4440276 |
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| Solorina saccata (L.) Ach. | T. A. Williams s.n. | Aug 1891 | United States of America | South Dakota | Pennington Co. Rapid City. | — | 4633897 |
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| Lecanora xanthophana var. dealbata Tuck. | T. A. Williams s.n. | Aug 1891 | United States of America | South Dakota | Bad Lands of South Dakota. | — | 4440282 |
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| Parmelia borreri (Sm.) Turner | T. A. Williams s.n. | Apr 1895 | United States of America | South Dakota | Brookings, South Dakota. | — | 04439982 |
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| Rinodina oreina (Ach.) A.Massal. | T. A. Williams s.n. | May 1895 | United States of America | South Dakota | Brookings, South Dakota. | — | 04439995 |
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| Acarospora | T. A. Williams s.n. | 27 Jul 1897 | United States of America | South Dakota | Belle Fourche River, at Egge's… | — | 4586881 |
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| Lecanora xanthophana var. dealbata Tuck. | T. A. Williams s.n. | 08 Jul 1897 | United States of America | Wyoming | Sweetwater Co. Green River. | — | 4440517 |
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