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A summary is provided of information on the biology of Pteridium aquilinum (L.) Kuhn, bracken, a fern species, cosmopolitan in its distribution and comprising several subspecies and varieties. Two varieties occur in Canada where they are particularly weedy in pastures and rough terrain. Bracken has been shown to be carcinogenic in rats, to be responsible for enzootic bovine haematuria in cattle, and to cause vitamin B1 avitaminosis in horses and other nonruminants.
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Cody et al. (1975) studied this question.
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