Displaying 8951 - 9002 out of 9002 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | Notice | ||
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| Lecanora epibryon (Ach.) Ach. | R. S. Williams 29 | 20 Jun 1898 | Canada | Yukon | Yukon R[iver] 20 mi. above… | — |
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| Lecanora epibryon (Ach.) Ach. | R. S. Williams 29 | 20 Jun 1898 | Canada | Yukon | Yukon R[iver] 20 mi. above… | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 89 | Apr 1899 | Canada | Yukon | Dawson. | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 51 | Apr 1899 | Canada | Yukon | Dawson. | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 57 | Apr 1899 | Canada | Yukon | Dawson. | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 88 | 27 Mar 1899 | Canada | Yukon | Dawson. | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 88 | Mar 1899 | Canada | Yukon | Dawson. | — |
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| Lecanora frustulosa (Dicks.) Ach. | R. S. Williams 57 | 09 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Leptogium saturninum (Dicks.) Nyl. | R. S. Williams 45 | 03 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Leptogium saturninum (Dicks.) Nyl. | R. S. Williams 45 | 03 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Masonhalea richardsonii (Hook.) Kärnefelt | R. S. Williams 74 | May 1899 | Canada | Yukon | near summit of Moosehide Mt.,… | — |
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| Masonhalea richardsonii (Hook.) Kärnefelt | R. S. Williams 74 | May 1899 | Canada | Yukon | near summit of Moosehide Mt.,… | — |
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| Mycobilimbia tetramera (De Not.) Brunnb. | R. S. Williams 48 | 07 May 1899 | Canada | Yukon | Dawson. | — |
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| Nephroma antarcticum (Wulfen) Nyl. | R. S. Williams 20 | May 1899 | Canada | Yukon | Lower Klondike River | — |
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| Protopannaria pezizoides (F.Weber) P.M.Jørg. & S.Ekman | R. S. Williams 33 | 13 Aug 1898 | Canada | Yukon | Dawson. | — |
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| Ramalina dilacerata (Hoffm.) Hoffm. | R. S. Williams 40 | Mar 1899 | Canada | Yukon | Dawson. | — |
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| Ramalina pollinaria (Westr.) Ach. | R. S. Williams 39 | — | Canada | Yukon | Dawson. | — |
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| Rhizocarpon geographicum (L.) DC. | R. S. Williams 81 | Apr 1899 | Canada | Yukon | Dawson. | — |
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| Squamarina lentigera (Weber) Poelt | R. S. Williams 64 | 13 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Squamarina lentigera (Weber) Poelt | R. S. Williams 64 | 13 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Stereocaulon tomentosum Fr. | R. S. Williams 84 | 24 May 1899 | Canada | Yukon | Dawson. | — |
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| Usnea filipendula Stirt. | R. S. Williams 73 | 13 Mar 1899 | Canada | Yukon | Dawson. | — |
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| Vulpicida pinastri (Scop.) J.-E.Mattsson | R. S. Williams 14 | 02 Oct 1898 | Canada | Yukon | Dawson. | — |
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| Vulpicida tilesii (Ach.) J.-E.Mattsson & M.J.Lai | R. S. Williams 66 | Oct 1898 | Canada | Yukon | Back of Dawson | — |
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| Vulpicida tilesii (Ach.) J.-E.Mattsson & M.J.Lai | R. S. Williams 66 | 23 Apr 1899 | Canada | Yukon | Dawson. | — |
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| Xanthoria elegans (Link) Th.Fr. | R. S. Williams 25 | 10 Feb 1898 | Canada | Yukon | Dawson. | — |
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| Philonotis calomicra Broth. | R. S. Williams 2390 | Feb 1905 | Philippines | — | S.W. Mindanao, near San Ramon,… | — | ||||
| Philonotis calomicra Broth. | R. S. Williams 2390 | Feb 1905 | Philippines | — | Near San Ramon, just above… | — | ||||
| Neoorthocaulis floerkei (F.Weber & D.Mohr) L.Söderstr., De Roo & Hedd. | R. S. Williams 5 | 19 Nov 1894 | United States of America | Montana | Flathead Co. Columbia Falls | — | ||||
| Neoorthocaulis floerkei (F.Weber & D.Mohr) L.Söderstr., De Roo & Hedd. | R. S. Williams | 19 Nov 1894 | United States of America | Montana | Flathead Co. Columbia Falls | — | ||||
| Philonotis hastata (Duby) Wijk & Margad. | R. S. Williams 1870 | Nov 1904 | Philippines | Benguet | Northern Luzon. Between Baguio and… | — | ||||
| Philonotis novoguineensis Reimers | R. S. Williams 1871 | Oct 1904 | Philippines | Benguet | Northern Luzon, Baguio | — | ||||
| Philonotis novoguineensis Reimers | R. S. Williams 1869 | Nov 1904 | Philippines | Benguet | Between Baguio and Sablan. | — | ||||
| Neoorthocaulis floerkei (F.Weber & D.Mohr) L.Söderstr., De Roo & Hedd. | R. S. Williams | 30 May 1898 | Canada | British Columbia | Lindeman [label as Yukon Region] | — | ||||
| Neoorthocaulis floerkei (F.Weber & D.Mohr) L.Söderstr., De Roo & Hedd. | R. S. Williams | 30 May 1898 | Canada | British Columbia | Lindeman [label as Yukon Region] | — | ||||
| Neoorthocaulis floerkei (F.Weber & D.Mohr) L.Söderstr., De Roo & Hedd. | R. S. Williams | 30 May 1898 | Canada | British Columbia | Lake Lindeman | — | ||||
| Schizothecium | R. S. Williams s.n. | Aug 1898 | United States of America | Wyoming | Big Horn Mountains | — | ||||
| Schizothecium | R. S. Williams s.n. | Aug 1898 | United States of America | Wyoming | Big Horn Mountains | — | ||||
| Thunbergia benguettensis Bremek. | R. S. Williams 935 | 10 Sep 1904 | Philippines | Benguet | Benguet Road, northern Luzon | type |
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| Anacardium excelsum (Kunth) Skeels | R. S. Williams 291 | 23 Feb 1908 - 22 Mar 1908 | Panama | — | Penonome and vicinity | — |
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| Anacardium occidentale L. | R. S. Williams 36 | 20 Feb 1908 | Panama | — | Ancon Hill | — |
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| Anacardium occidentale L. | R. S. Williams 407 | 23 Feb 1908 - 22 Mar 1908 | Panama | — | Penonome and Vicinity | — |
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| Anacardium excelsum (Kunth) Skeels | R. S. Williams 1160 | 1908 | Panama | — | Cituro | — |
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| Anacardium excelsum (Kunth) Skeels | R. S. Williams 408 | 23 Jul 1908 - 22 Mar 1908 | Panama | — | Penonome and vicinity | — |
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| Sabicea brasiliensis Wernham | R. S. Williams 303 | 28 Feb 1902 | Bolivia | — | Apolo | syntype |
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| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | 18 Sep 1894 | United States of America | Montana | Flathead Co. Columbia Falls | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | 22 May 1898 | Canada | British Columbia | Lake Lindeman | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | 22 May 1898 | Canada | British Columbia | Lake Lindeman | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | 22 May 1898 | Canada | British Columbia | Lindeman [label as Yukon Region] | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | 22 May 1898 | Canada | British Columbia | Lindeman [label as Yukon Region] | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams 4 | 26 Sep 1891 | United States of America | Montana | Cascade Co. Belt Mts. | — | ||||
| Barbilophozia lycopodioides (Wallr.) Loeske | R. S. Williams | Sep 1891 | United States of America | Montana | Cascade Co. Belt Mts. | — |