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On the grounds of morphology and distribution, it has been suggested that Athrotaxis laxi/olia is a hybrid between A. cupressoides and A. selaginoides. To test this hypothesis the cytology of the genus was investigated. All three species of Athrotaxis have 2n = 22 chromosomes in somatic cells and n = 11 in pollen grains.
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Heather F Gulline (1952) studied this question.
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