Monographs Details: Polytrichum sexangulare Flörke ex Brid.
Authority: Buck, William R. 1987. Bryostephane Steereana: A Collection of Bryological Papers Presented to William Campbell Steere On The Occasion of His 80th Birthday. Mem. New York Bot. Gard. 45: 1-749.
Discussion:A species of acidic tundra, most commonly occurring on periodically wet frost boils (non-sorted circles). Often occurring with Conostomum tetragonum and on similar acidic substrates as Paraleucobryum enerve.