Displaying 1 - 25 out of 1044 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Batrachospermum vagum var. flagelliforme f. tenuissima Collins | I. Holden s.n. | 24 Aug 1896 | United States of America | New York | Hamilton Co. Adirondack Mountains, near… | type | 00922285 |
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| Spirogyra porticalis f. minor Collins | I. Holden s.n. | 08 May 1892 | United States of America | Connecticut | Fairfield Co. among other (sterile)… | type | 01475115 |
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| Didymoprium grevillei | I. Holden s.n. | 11 May 1890 | United States of America | Connecticut | Fairfield Co. Stillman's Pond | — | 02013991 |
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| Didymoprium grevillei | I. Holden s.n. | 11 May 1890 | United States of America | Connecticut | Fairfield Co. Stillman's Pond | — | 02014009 |
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| Mougeotia genuflexa (Roth) C.Agardh | I. Holden 668 | 02 Aug 1892 | United States of America | Connecticut | Fairfield Co. Peck's Mill Pond,… | — | 02014581 |
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| Mougeotia genuflexa (Roth) C.Agardh | I. Holden s.n. | 01 Jul 1894 | United States of America | Connecticut | Fairfield Co. Putney, Peck's Mill… | — | 02014582 |
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| Mougeotia genuflexa (Roth) C.Agardh | I. Holden s.n. | 01 Jul 1894 | United States of America | Connecticut | Fairfield Co. Putney, Peck's Mill… | — | 02014592 |
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| Mougeotia genuflexa (Roth) C.Agardh | I. Holden s.n. | 01 Jul 1894 | United States of America | Connecticut | Fairfield Co. Putney, Peck's Mill… | — | 02014605 |
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| Mougeotia robusta (de Bary) Wittr. | I. Holden s.n. | 05 Jun 1892 | United States of America | Connecticut | Fairfield Co. Pequonnock River | — | 02014682 |
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| Spirogyra nitida | I. Holden 643 | 19 Jul 1892 | — | — | Factory Pond Darun [?] | — | 02015402 |
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| Zygogonium anomalum Kütz. | I. Holden s.n. | 12 Jun 1892 | United States of America | Connecticut | Fairfield Co. Pequonnock River | — | 02016378 |
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| Porphyra leucosticta Thur. | I. Holden s.n. | 18 Apr 1897 | United States of America | Connecticut | Bridgeport Harbor | — | 01003805 |
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| Porphyra leucosticta Thur. | I. Holden s.n. | 26 Mar 1890 | United States of America | Connecticut | Fairfield Co. Sea Side Park | — | 01003804 |
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| Porphyra leucosticta Thur. | I. Holden | 18 Apr 1897 | United States of America | Connecticut | Bridgeport Harbor | — | 01003864 |
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| Porphyra leucosticta Thur. | I. Holden | 12 Feb 1891 | United States of America | New Jersey | Seaside Park | — | 01003850 |
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| Porphyra leucosticta Thur. | I. Holden 1081 | 14 Apr 1895 | United States of America | — | Cook's Point | — | 01003796 |
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| Porphyra miniata (C.Agardh) C.Agardh | I. Holden s.n. | 27 Jul 1897 | Canada | Newfoundland and Labrador | St. John's, just within the… | — | 02016884 |
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| Porphyra purpurea (Roth) C.Agardh | I. Holden s.n. | 26 Aug 1888 | United States of America | Connecticut | Thimble Island | — | 02017060 |
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| Bangia fuscopurpurea (Dillwyn) Lyngb. | I. Holden 129 | 11 Aug 1890 | United States of America | Maine | Hancock Co. Mount Desert, Seal… | — | 02105142 |
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| Bangia fuscopurpurea (Dillwyn) Lyngb. | I. Holden s.n. | 30 Nov 1893 | United States of America | Connecticut | Fairfield Co. between tide marks | — | 02105392 |
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| Chaetophora pisiformis (Roth) C.Agardh | I. Holden s.n. | 26 Jun 1892 | — | — | — | 02105847 |
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| Draparnaldia glomerata (Vaucher) C.Agardh | I. Holden s.n. | s.d. | — | — | at first attached to sticks,… | — | 02106305 |
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| Draparnaldia plumosa (Vaucher) C.Agardh | I. Holden s.n. | 14 Feb 1892 | United States of America | Connecticut | Fairfield Co. attached to stones… | — | 02106401 |
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| Microspora amoena (Kütz.) Rabenh. | I. Holden s.n. | — | Unknown | — | [illegible] | — | 02106854 |
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| Oedogonium boscii Wittr. ex Hirn | I. Holden s.n. | 02 Jul 1893 | United States of America | Connecticut | Fairfield Co. on submerged plants… | — | 02107198 |
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