Explanation of Plate IV.— a, Dicranum undu latum x e. 

 a', Leaf x 8. b, D. Drummondii xi. b', Leaf x S. c, D.Jiagel- 

 lare X2. c', Leaf x 10. d, Flagella X ro. e, D. fulvum X 2. 

 e', Leaf and capsule x 10. 



