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:This species is often considered a variety of T. mnioides (as var. cavifolius); however, the xeric, tundra habitat, lack of observed intergradation and distinctive capsule and leaf shapes lead us to consider this a separate species.