Bell, N.E.; Hyvönen, J. 2010: A phylogenetic circumscription of Polytrichastrum (Polytrichaceae): Reassessment of sporophyte morphology supports molecular phylogeny. American Journal of Botany 97(4): 566–578.

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Bell, N.E.; Hyvönen, J. 2010: A phylogenetic circumscription of Polytrichastrum (Polytrichaceae): Reassessment of sporophyte morphology supports molecular phylogeny. American Journal of Botany 97(4): 566–578.