Displaying 26 - 50 out of 291 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Calosphaeria abnormis (Fr.) Höhn. | F. Petrak s.n. | Aug 1914 | Austria | — | Weisskirchen | — |
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| Calospora platanoidis var. sorbi Destrée & Rolland | F. Petrak s.n. | 11 Jul 1918 | Poland | — | [Locality information is illegible] | — |
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| Campanula rotundifolia L. | F. Petrak 50191 | 08 Aug 1950 | United States of America | Wyoming | Albany Co. University Summer Camp,… | — |
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| Castilleja rhexifolia Rydb. | F. Petrak 50039 | 09 Aug 1950 | United States of America | Wyoming | Albany Co. Near woods, Brooklyn… | — |
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| Caudospora taleola (Fr.) Starbäck | F. Petrak s.n. | Aug 1923 | Czech Republic | — | West Beskiden, Wsetin [Vsetí] | — |
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| Caudospora taleola (Fr.) Starbäck | F. Petrak s.n. | Apr 1936 | — | — | — |
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| Chalcosphaeria pustula (Pers.) Höhn. | F. Petrak s.n. | May 1936 | Germany | — | Weißkirchen, Marienthal | — |
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| Chamaerhodos erecta (L.) Bunge | F. Petrak 50053 | 12 Aug 1950 | United States of America | Wyoming | Albany Co. Roadside, Hwy. 30,… | — |
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| Cirsium altissimum (L.) Spreng. | F. Petrak 105 | 27. IX.,2.X. 1913 | United States of America | Missouri | Jasper Co. Webb City | — |
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| Cirsium brevistylum Cronquist | F. Petrak 46 | 27 May 1911 | United States of America | California | San Bernardino Co. | — |
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| Cirsium lappaceum var. ramosum Petr. | F. Petrak s.n. | Jul 1912-1915 | Czech Republic | — | E seminibus a cl. G.… | possible type |
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| Cirsium sychnosanthum Petr. | F. Petrak s.n. | Jun 1914-Jul 1914 | Czech Republic | — | E seminibus plantae loco indicato… | possible type |
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| Coltricia perennis (L.:Fr.) Murrill | F. Petrak 468 | Sep 1924 | — | — | — |
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| Coniothyrium massariae Petr. | F. Petrak s.n. | May 1939 | Austria | Lower Austria | Niederösterreich. Vienna, Danube (as Danau-… | type |
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| Coniothyrium scopariicola Petr. | F. Petrak s.n. | Sep 1913 | Czech Republic | — | MoraviaM-Weisskirchen, Hrabuvka | type |
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| Coniothyrium sydowianum Petr. | F. Petrak s.n. | 17 Jan 1919 | Czech Republic | — | MoraviaM-Weisskirchen, Mil-Oberralschule | type |
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| Craterellus cornucopioides (L.) Pers. | F. Petrak s.n. | Aug 1922 | — | — | — |
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| Cryptodiaporthe aesculi (Fuckel) Petr. | F. Petrak s.n. | Sep 1920 | Germany | — | Weisskirchen | — |
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| Cryptodiaporthe liquidambaris Petr. | F. Petrak s.n. | 17 May, 25 May 1950 | United States of America | Maryland | Prince George's Co. Wälder der… | type | ||||
| Cryptodiaporthe liquidambaris Petr. | F. Petrak s.n. | 25 May 1950 | United States of America | Maryland | Prince George's Co. Wälder der… | type | ||||
| Cryptospora suffusa (Fr.) Tul. & C.Tul. | F. Petrak 3525 | Oct. 1942 | Czech Republic | — | Moravia orient.: ad ripam fluminis… | — |
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| Cryptospora suffusa (Fr.) Tul. & C.Tul. | F. Petrak 3525 | Oct. 1942 | — | — | Moravia orient: ad ripam fluminis… | — |
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| Cryptospora suffusa (Fr.) Tul. & C.Tul. | F. Petrak 606 | 9.V.1918 | — | — | — |
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| Cryptospora suffusa (Fr.) Tul. & C.Tul. | F. Petrak 629 | 23.I.1918 | — | — | — |
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| Cryptosporella leptasca (Peck & Clinton) Sacc. | F. Petrak 2033 | Sep 1912 | — | — | Mahrisch Weisskirchen | — |
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