I liked their effect on ferns, but that is an isolated case too

Iris Cohen schreef in
What did the Ice Age do for ferns?

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I would not say "for ferns", as it is not really positive, but it was
certainly interesting. The haploid-diploid cycle manifests itself in ferns
in big diploid sporophytes and small haploid gametophytes except in some
populations hit by the Ices Ages.
PvR