Displaying 1 - 50 out of 232 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Albugo candida (Pers.) Roussel | J. C. Arthur s.n. | 04 Aug 1886 | United States of America | New Hampshire | Geneva | — |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | J. C. Arthur s.n. | 08 Jul 1891 | United States of America | Indiana | Tippecanoe Co. Lafayette. | — |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | J. C. Arthur s.n. | Sep 1895 | United States of America | Indiana | Lafayette | — |
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| Albugo ipomoaea-panduratae (C.Schweinf.) D.B.Swingle | J. C. Arthur 21176 | Oct 1921 | — | — | — |
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| Albugo tragopogonis (Pers.) Gray | J. C. Arthur s.n. | 14 Sep 1885 | United States of America | New York | Ontario Co. Geneva | — |
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| Apopellia endiviifolia (Dicks.) Nebel & D.Quandt | J. C. Arthur 175A | 24 Jul 1886 | United States of America | Minnesota | Vermilion Lake | — | ||||
| Arceuthobium pusillum Peck | J. C. Arthur s.n. | 15 Aug 1900 | United States of America | Maine | Isle au Haut | — |
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| Artemisia dracunculus L. | J. C. Arthur s.n. | Aug 1870 | United States of America | Iowa | Ames | — |
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| Astragalus crassicarpus Nutt. var. crassicarpus | J. C. Arthur s.n. | 09 May 1877 - 30 May 1877 | United States of America | Iowa | Ames | — |
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| Astragalus crassicarpus Nutt. var. crassicarpus | J. C. Arthur s.n. | May 1870 | United States of America | Iowa | Ames | — |
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| Astragalus lotiflorus Hook. | J. C. Arthur s.n. | s.d. | United States of America | Iowa | Dubuque Co. Charles City | — |
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| Besseya bullii (Eaton & Wright) Rydb. | J. C. Arthur s.n. | 25 May 1874 | United States of America | Iowa | Charles City | — |
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| Botrychium simplex E.Hitchc. | J. C. Arthur 2 | 29 Jul 1912 | United States of America | Colorado | Ouray Co. Wooded slopes east… | — |
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| Bovista plumbea Pers.:Pers. | J. C. Arthur | Sep 1889 | United States of America | Indiana | Vermillion Co. | — | ||||
| Bremia lactucae Regel | J. C. Arthur 1885-10-02 | — | United States of America | New York | Ontario Co. Geneva. | — |
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| Bromus ciliatus L. | J. C. Arthur 734 | 1881 | United States of America | Iowa | — |
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| Calamagrostis canadensis (Michx.) P.Beauv. | J. C. Arthur s.n. | 12 Aug 1875 | United States of America | Iowa | Charles City | — |
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| Carex arcta Boott | J. C. Arthur B100 | 17 Jul 1886 | United States of America | Minnesota | Vermilion Lake. | — |
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| Carex bicknellii Britton | J. C. Arthur s.n. | 11 Jun 1874 | United States of America | Iowa | Floyd Co. Charles City, Iowa.… | — |
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| Carex buxbaumii Wahlenb. | J. C. Arthur s.n. | 11 Jun 1874 | United States of America | Iowa | Charles City. | — |
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| Carex davisii Schwein. & Torr. | J. C. Arthur s.n. | 02 Jun 1877 | United States of America | Iowa | Ames. | — |
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| Carex hystricina Muhl. ex Willd. | J. C. Arthur s.n. | — | — | — | — |
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| Carex paupercula Michx. | J. C. Arthur 60 | 21 Sep 1909 | United States of America | Maine | Knox Co. Isle au Hart. | — |
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| Carex paupercula Michx. | J. C. Arthur B298 | 23 Jul 1886 | United States of America | Minnesota | St. Louis R. | — |
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| Carex scoparia Schkuhr ex Willd. | J. C. Arthur B466 | 29 Jul 1886 | United States of America | Minnesota | Agate Bay | — |
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| Carex scoparia Schkuhr ex Willd. | J. C. Arthur B126 | 20 Jul 1886 | United States of America | Minnesota | Vermilion Lake. | — |
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| Carex tribuloides var. cristata Wahlenb. | J. C. Arthur 20 | 18 Jul 1877 | United States of America | Iowa | Story Co. | — |
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| Carex umbellata Schkuhr ex Willd. | J. C. Arthur s.n. | 25 Jun 1887 | United States of America | Iowa | Spirit Lake. | — |
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| Carya cordiformis (Wangenh.) K.Koch | J. C. Arthur s.n. | 04 Jun 1874 | United States of America | Iowa | Floyd Co. Charles City. | — |
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| Catinella nigro-olivacea (Schwein.) Durand | J. C. Arthur 189.86 | 23 Jul 1886 | United States of America | Minnesota | St. Louis River | — |
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| Cercospora racemosa Ellis & G.Martin | J. C. Arthur 48 | 27 Sep 1882 | United States of America | Iowa | Floyd Co. | type |
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| Chaetomella perforata Ellis & Everh. | J. C. Arthur 57 | Sep 1882 | United States of America | Iowa | Story Co. | lectotype |
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| Chaetomella perforata Ellis & Everh. | J. C. Arthur 57 | Sep 1882 | United States of America | Iowa | Story Co. | lectotype |
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| Chara braunii C.C.Gmel. | J. C. Arthur D | 14 Jul 1882 | United States of America | Minnesota | Hennepin Co. Oak Lake | — |
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| Chara compacta C.B.Rob. | J. C. Arthur C | 14 Jul 1882 | United States of America | Minnesota | Hennepin Co. Oak Lake | — |
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| Chara contraria A.Braun ex Kütz. | J. C. Arthur E | 17 Jul 1882 | United States of America | Minnesota | Hennepin Co. Excelsior on Lake… | — |
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| Chara contraria A.Braun ex Kütz. | J. C. Arthur J | 04 Aug 1882 | United States of America | Minnesota | Ramsey Co. Lake Phalen near… | — |
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| Chara contraria A.Braun ex Kütz. | J. C. Arthur s.n. | 04 Jul 1874 | United States of America | Iowa | Cerro Gordo Co. Clear Lake | — |
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| Chara contraria A.Braun ex Kütz. | J. C. Arthur G | 24 Jul 1882 | United States of America | Minnesota | Hennepin Co. Lake Calhoun | — |
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| Chara formosa C.B.Rob. | J. C. Arthur H | 24 Jul 1882 | United States of America | Minnesota | Hennepin Co. Lake Calhoun, in… | — |
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| Chara formosa C.B.Rob. | J. C. Arthur B | 10 Jul 1882 | United States of America | Minnesota | Hennepin Co. Lake Calhoun | — |
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| Chara formosa C.B.Rob. | J. C. Arthur F | 25 Jul 1882 | United States of America | Minnesota | Hennepin Co. | — |
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| Chara intermedia A.Braun | J. C. Arthur K | 07 Aug 1882 | United States of America | Iowa | Floyd Co. Nora Springs, ditch… | — |
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| Chara vulgaris L. | J. C. Arthur I | 27 Jul 1882 | United States of America | Minnesota | Hennepin Co. Minnehaha Falls, in… | — |
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| Cirsium scariosum Nutt. | J. C. Arthur 5004 | 01 Aug 1912 | United States of America | Colorado | Ridgeway. | — |
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| Cladosporium cucumerinum Ellis & Arthur | J. C. Arthur s.n. | s.d. | United States of America | New York | Ontario Co. | holotype |
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| Clematis orientalis L. | J. C. Arthur 1 | 31 Jul 1912 | United States of America | Colorado | Ouray Co. | — |
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| Coccomyces triangularis (Schwein.) Sacc. | J. C. Arthur s.n. | 18 Jun 1887 | United States of America | New York | Geneva | — |
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| Coleroa plantaginis (Ellis) M.E.Barr | J. C. Arthur s.n. | 30 Sep 1882 | United States of America | Iowa | Floyd Co. | — |
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| Conocephalum salebrosum Szweyk., Buczkowska & Odrzykoski | J. C. Arthur A100 | 21 Jul 1886 | United States of America | Minnesota | Cass Co. Vermillion Lake | — |