Displaying 901 - 919 out of 919 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Erysiphe galeopsidis DC. | T. A. Williams | Sep 1898 | United States of America | Montana | Missoula | — | 2938284 |
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| Erigeron ochroleucus Nutt. var. ochroleucus | T. A. Williams | 19 Aug 1898 | United States of America | Wyoming | Big Horn Co. Big Horn… | — | 2091961 |
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| Dichanthelium acuminatum (Sw.) Gould & C.A.Clark var. acuminatum | T. A. Williams | 12 Jun 1897 | United States of America | District of Columbia | Takoma Park | — | 1592825 |
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| Dichanthelium acuminatum (Sw.) Gould & C.A.Clark var. acuminatum | T. A. Williams | 12 Jun 1897 | United States of America | District of Columbia | Takoma Park | — | 1592827 |
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| Dichanthelium portoricense (Desv. ex Ham.) B.F.Hansen & Wunderlin | T. A. Williams | 12 Jun 1897 | United States of America | District of Columbia | Takoma Park | — | 1715245 |
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| Dichanthelium acuminatum (Sw.) Gould & C.A.Clark var. acuminatum | T. A. Williams | 12 Jun 1897 | United States of America | District of Columbia | Takoma Park | — | 1592992 |
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| Imshaugia placorodia (Ach.) S.L.F.Mey. | T. A. Williams | Mar 1898 | United States of America | District of Columbia | Rock Creek. | — | 1566400 |
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| Pertusaria pustulata (Ach.) Duby | T. A. Williams | Apr 1898 | United States of America | District of Columbia | Takoma Park | — | 2467612 |
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| Trapelia glebulosa (Sm.) J.R.Laundon | T. A. Williams | Jan 1898 | United States of America | District of Columbia | Takoma Park | — | 1410536 |
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| Plagiomnium cuspidatum (Hedw.) T.J.Kop. | T. A. Williams | 13 Jun 1895 | United States of America | South Dakota | Big Stone | — | 395568 | ||
| Buellia stillingiana J.Steiner | T. A. Williams | 1897 | United States of America | Wyoming | Big Horn Mountains | — | 1613378 |
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| Orthotrichum anomalum Hedw. | T. A. Williams | Aug. 1891 | United States of America | South Dakota | Pennington Co. Black Hills | — | 421372 | ||
| Tilletia externa Griffiths | T. A. Williams | Aug 1898 | United States of America | Wyoming | Buffalo. | type material | 00738523 |
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| Tilletia externa Griffiths | T. A. Williams | Aug 1898 | United States of America | Wyoming | Buffalo. | type material | 00738531 |
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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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| Xanthoparmelia lineola (E.C.Berry) Hale | T. A. Williams | Aug 1891 | United States of America | South Dakota | Pennington Co. Black Hills | — | 02686590 | ||
| Phormidium inundatum Kütz. | T. A. Williams | D. Griffiths 1 | 01 Sep 1898 | United States of America | Montana | Yellowstone Co. on pottoms of… | — | 02348126 |
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| Hydrurus foetidus (Vill.) Trevis. | T. A. Williams | D. Griffiths s.n. | 20 Aug 1898 | United States of America | Wyoming | near Buffalo, North Fork Clear… | — | 02223785 |
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| Prasiola mexicana J.Agardh | T. A. Williams | D. Griffiths s.n. | 20 Aug 1898 | United States of America | Wyoming | near Buffalo, North Fork Clear… | — | 02144350 |
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