Monographs Details: Calyptothecium patulum (Broth.) M.Fleisch.
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:The plants of the type collection of this species are ± larger than those of the type of M. wightii, being ca. 4 cm long, and the leaves having a size of 3.5 × 1.8 mm. The apices ofthe secondary stems are obtuse, not caudate. Aside from the size of plants, no taxonomic differences between type specimens were found (Fig. 8).