22 A MANUAL OF MOSSES 



124. Not with the characters combined 

 as above 125 



125. Stetn and branch-leaves often dissimilar, 

 stem-leaves ovate-to triangular-cordate 

 or rounded triangular-oval, obtuse to 

 somewhat acuminate; costa often ending 

 in a spine; leaf-cells very narrow and 

 smooth 126 



125. Stem-leaves more or less concave, ir- 

 regularly plicate; cells elongated-rhom- 

 boid to elongated-hexagonal; branch- 

 leaves rough on the back by papillae or 

 tooth-like projecting cell-angles; seta 



very rough Bryhnia, p. 352 



126. Leaves not or very little concave, 



never plicate; seta mostly rough... Oxyrhynchium, p. 347 

 126. Leaves more or less concave, most- 

 ly distinctly plicate; seta mostly 

 smooth Burhynchium, p. 350 



127. Mostly not aquatic, sometimes submerged but 



yet floating Fissidens, p. 79 



127. Aquatic, filiform, and floating Octodiceras, p. 86 



