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Burkau-Pannewitz, 1929
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Burkau-Pannewitz, 1929
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Burkau-Pannewitz, 1929
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Lugano, 1928.04
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Tessin, Schweiz, 1928.04
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Burkau-Pannewitz, 1929
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Burkau, 1929
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Europa, 1950/1967
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Pannewitz, 1929
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Pannewitz, 1929
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Pannewitz, 1929
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vor 1930
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JSTOR, 1919
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American Fern Society, 1919
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JSTOR, 1919
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American Fern Society, 1919
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Polish Botanical Society, 2013
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2009
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New England Botanical Club, 1947
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JSTOR, 1939