United States, California, Santa Clara, Stanford University
Common in small mats on stones bordering flower-beds.
Is a species of the group of B. Fallax, but differs from this by its shorter peristome, less twisted, and by its cellules smooth or very slightly papillose. B. spar-idens C. M. et Kindb. of the same group, appears to differ from our species by the distinctly papillose cellules, the inferior rectangular, hyaline. B. semitorta Sulliv. is distinguished by its leaf narrower at the base and with the border plane.