Ecology: Humid puna; on rocks or soil covered rocks. Elevation: 4000 m. Distribution: Mexico and Bolivia.
Resembling Bryum argenteum, B. insolitum is distinguished by the nearly erect capsules, narrowed mouth, low endostomal basal membrane, and 1-2 short, nodulose cilia. This species is only known from a single collection made by Rusby from Sorata; for Bolivia this species is considered tentative since the sporophytes were immature (Ochi 1980: 112).
Specimens: BOLIVIA. La Paz: Rusby 3144 (BM; Ochi 1980: 112).