Monographs Details: Plagiothecium cavifolium (Brid.) Z.Iwats.
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:Reported as new to the Yukon by Vitt and Horton (1978). Although common in eastem North America, this species is rare in the northwestem portion of the continent. In the Yukon, it is found on moist siliceous cliffs, at Keele Peak in close proximity to Marsupella arctica.