Displaying 1 - 25 out of 316 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Calymperes porrectum Mitt. | T. Powell 10 | Oct 1831 | American Samoa | — | Tutuila | holotype |
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| Macromitrium powellii Mitt. | T. Powell s.n. | 1859 | American Samoa | — | Tutuila | lectotype |
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| Solidago simplex subsp. simplex var. bellidifolia | T. Powell s.n. | 07 Aug 1882 | United States of America | Washington | Yakima Co. Moraines, Mt. Adams. | — |
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| Meteorium aeruginosum Mitt. | T. Powell 88 | 1885 | Samoa | — | Upolu | holotype |
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| Meteorium aeruginosum Mitt. | T. Powell 88 | 1885 | Samoa | — | Upolu | isotype |
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| Usnea | T. Powell 156 | 01 Nov 1947 | Samoa | — | — |
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| Vitis candicans Engelm. ex A.Gray | T. Powell 39 | 28 Apr 1963 | United States of America | Texas | Brazos Co. | — |
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| Lepidozia infuscata Mitt. | T. Powell | — | Samoa | — | type material |
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| Lepidozia infuscata Mitt. | T. Powell | — | Samoa | — | type material |
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| Lepidozia infuscata Mitt. | T. Powell | — | Samoa | — | type material |
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| Lepidozia brevidentata Mitt. | T. Powell | — | Samoa | — | holotype |
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| Lepidozia brevidentata Mitt. | T. Powell | — | Samoa | — | paratype |
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| Lepidozia brevidentata Mitt. | T. Powell | — | Samoa | — | type |
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| Eriopus pacificus var. samoanus H.Whittier | T. Powell | — | Samoa | — | holotype |
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| Acroporium macrorhynchum Mitt. | T. Powell 115 | s.d. | American Samoa | — | Manua | holotype |
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| Acroporium macrorhynchum Mitt. | T. Powell 115 | s.d. | American Samoa | — | Manua | holotype |
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| Acroporium brevicuspidatum Mitt. | T. Powell 137 | s.d. | Samoa | — | Upolu. Manua. | isotype |
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| Hypnum complanatulum Müll.Hal. | T. Powell 55 | — | Samoa | — | lectotype |
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| Hypnum complanatulum Müll.Hal. | T. Powell 55 | — | Samoa | — | syntype |
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| Mastigopelma subsimplex Mitt. | T. Powell | — | Samoa | — | holotype |
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| Mastigopelma subsimplex Mitt. | T. Powell | — | Samoa | — | isotype |
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| Mastigopelma subsimplex Mitt. | T. Powell | — | Samoa | — | isotype |
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| Mastigopelma subsimplex Mitt. | T. Powell | — | Samoa | — | isotype |
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| Acroporium lamprophyllum Mitt. | T. Powell 114 | s.d. | Samoa | — | Upolu. | type |
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| Acroporium lamprophyllum Mitt. | T. Powell 114 | s.d. | Samoa | — | Upolu. | holotype |
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