Monographs Details: Mnium thomsonii Schimp.
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:One plant with two leaves, 1.45-1.56 m (one isolated leaf and one stem fragment with attached partial leaf, 1.38-1.48 m, deerminable only to genus). The illustrated fossil is simlar to sterile plants of M . thomsonii in its oval, divergent leaves, which have a marginal border, double teeth, and upper cells generally <20 µm. Fig. 2k, 1.