Discussion:Key to the Varieties of Fissidens pellucidus1. Laminal cells conspicuously prorate 72c. var. papilliferus (p. 205).1. Laminai cells smooth 2.2. Costa ending well below leaf apex, as manyas 23 cells 72b.var. asterodontius (p. 205).2. Costa ending near the apex, no more than 5 cells below, to excurrent 72a. var.pellucidus (p. 201).