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*Tetsuoh SHIROTA
The Hokkaido University Museum
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Hideyuki SAITO
Lab of Silviculture, Department of Agriculture, Hokkaido University
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Trofim MAXIMOV
Institute of Biological Problem Cryolithic Zone
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Ayal MAKSIMOV
Institute of Biological Problem Cryolithic Zone
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Alexander KONONOV
Institute of Biological Problem Cryolithic Zone
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Kunihide TAKAHASHI
Lab of Silviculture, Department of Agriculture, Hokkaido University