PLATE VI. a. Pogonatum brevicaule, X 2. a'. Leaf, X 15. a". Cap- 

 sule X 10. b. P. urmgerum, X 2. b'. Z^af, X 10. c. P. alpinum, X 2. 

 c'. Z,ea^ X 10. c". Capsule, X 10. 



