Displaying 1 - 25 out of 553 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Abortiporus biennis (Bull.:Fr.) Singer | L. O. Overholts 3269 | — | United States of America | Ohio | West Elkton | — |
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| Acer glabrum Torr. | L. O. Overholts s.n. | 16 Jul 1914 | United States of America | Colorado | Gilpin Co. | — |
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| Achillea millefolium L. | L. O. Overholts s.n. | 02 Jul 1914 | United States of America | Colorado | Gilpin Co. | — |
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| Aconitum columbianum Nutt. var. columbianum | L. O. Overholts s.n. | 19 Jul 1914 | United States of America | Colorado | Gilpin Co. | — |
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| Aconitum columbianum Nutt. var. columbianum | L. O. Overholts s.n. | 09 Jul 1914 | United States of America | Colorado | Boulder Co. L. Eldora | — |
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| Actaea rubra (Aiton) Willd. | L. O. Overholts s.n. | 01 Jul 1914 | United States of America | Colorado | Gilpin Co. | — |
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| Agaricus viridarius With. | L. O. Overholts 3320 | s.d. | — | — | — |
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| Agoseris aurantiaca var. purpurea (A.Gray) Cronquist | L. O. Overholts s.n. | 30 Jun 1914 | United States of America | Colorado | Tolland, Colorado | — |
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| Agrocybe semiorbicularis (Bull.:Fr.) Fayod | L. O. Overholts s.n. | 7/2/36 | United States of America | Pennsylvania | Huntingdon Co. Pine Hill | — |
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| Albatrellus cristatus (Schaeff.:Fr.) Kotl. & Pouzar | L. O. Overholts s.n. | 28 Aug 1935 | United States of America | Ohio | Hocking Co. Rock House State… | — |
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| Albugo portulacae (DC.) Kuntze | L. O. Overholts s.n. | 30 Jun 1944 | United States of America | Pennsylvania | Centre Co. State College | — |
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| Aleurodiscus rubrotinctus Overh. [ined.] | L. O. Overholts 16732 | 19 Feb 1933 | United States of America | Pennsylvania | Huntingdon Co. Stone Creek | taxon ined. |
![Aleurodiscus rubrotinctus Overh. [ined.]](https://sweetgum.nybg.org/images3/1707/792/00946038.thumb.jpg)
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| Allium geyeri S.Watson | L. O. Overholts s.n. | 09 Jul 1914 | United States of America | Colorado | L. Eldora | — |
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| Allium geyeri S.Watson | L. O. Overholts s.n. | 18 Jul 1914 | United States of America | Colorado | Kingston Peak | — |
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| Allium recurvatum Rydb. | L. O. Overholts s.n. | 22 Jul 1913 | United States of America | Colorado | Gilpin Co. | — |
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| Amanita albocreata (G.F.Atk.) E.-J.Gilbert | L. O. Overholts s.n. | 20 Jul 1941 | United States of America | Pennsylvania | Centre Co. Synagogus (Synagogue?) Road… | — |
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| Amanita albocreata (G.F.Atk.) E.-J.Gilbert | L. O. Overholts s.n. | 23 Jul 1941 | United States of America | Pennsylvania | Centre Co. Shingletown Gap | — |
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| Amanita bisporigera G.F.Atk. | L. O. Overholts s.n. | 24 Jul 1938 | United States of America | Pennsylvania | Huntingdon Co. Laurel Run | — |
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| Amanita bisporigera G.F.Atk. | L. O. Overholts s.n. | 04 Sep 1936 | United States of America | Virginia | Biological Station, Mt. Lake | — |
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| Amanita brunnescens G.F.Atk. | L. O. Overholts s.n. | 23 Jul 1943 | United States of America | Pennsylvania | Huntingdon Co. Laurel Run | — |
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| Amanita caesarea (Scop.:Fr.) Pers. | L. O. Overholts s.n. | 26 Jul 1920 | United States of America | Pennsylvania | Clinton Co. Forestry camp, Lamar | — |
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| Amanita caesarea (Scop.:Fr.) Pers. | L. O. Overholts s.n. | 29 Jul 1937 | United States of America | Pennsylvania | Huntingdon Co. Laurel Run | — |
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| Amanita caesarea (Scop.:Fr.) Pers. | L. O. Overholts s.n. | 23 Jun 1944 | United States of America | Pennsylvania | Mifflin Co. Seven Mountains | — |
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| Amanita caesarea (Scop.:Fr.) Pers. | L. O. Overholts s.n. | 10 Aug 1919 | United States of America | Pennsylvania | Huntingdon Co. Charter Oak [Research… | — |
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| Amanita caesarea (Scop.:Fr.) Pers. | L. O. Overholts s.n. | 28 Sep 1921 | United States of America | Pennsylvania | Centre Co. Reitz Gap | — |
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