— T4— 



beginners almost invariably refer to Mnium. The capsules are 

 usually more slender, longer necked, and more pendendent. 



Webera ( Pohlia of the L. & J. Manual ) is so much like 

 Bryum that a word of warning may not be out of place here. The 

 leaf cells in Webera are much longer than in Bryum. Our most 

 common species ( W. nutans) is offered this quarter by the Sul- 

 livant Moss Chapter, in order to help distinguish these two genera. 



KEY TO BRYUM. 



1. Leaves bordered, . . .2. 



Leaves not bordered, at least in the upper half, 19. 



2. Costa plainly vanishing below apex 3- 



Costa percurrent or excurrent, . . . 4- 



3. Upper leaves orbicular, obtuse. . . C) clophyllum. 



Upper leaves acute, with long decurrent wings, Duvalii. 



4. Leaf cells above base with length less than twice their 



diameter capillare . 



Leaf cells more than 2.5 -. I, . . . . 5- 



5. Apex of leaf serrate, or excurrent costa toothed 6. 



Apex of leaf entire, or excurrent costa smooth, 16. 



6. Plants large, 3 cm. or more in height, . . . . i3- 



Plants smaller, 2 cm. or less in height, . . . 7. 



7. Endostome adherent to peristome, cilia lacking, . .8. 



Endostome free, with 2-4 appendiculate cilia, . 10. 



8. Capsule prominent on the back, mouth oblique, costa 



shortly excurrent, border 2-3 stratose, autoicous, . 



uliginosum {cernuum) . 

 Capsule regular, costa long excurrent, border of one 



layer of cells, usually synoicous, . . . . 9- 



9. Capsule narrowly pyriform, long necked, teeth of peris- 



tome simply articulate mc/malum,- 



Capsule ventricose in the middle, short necked ; teeth 

 of peristome with the transverse bars connected 

 together by numerous oblique or nearly vertical lines 

 on the inner surface of the teeth, pendulum. 



10. Costa long excurrent; dioicous, . . . caspiticium. 



Costa long excurrent ; synoicous, . . . . 11. 



Costa long excurrent ; autoicous, . pallescens. 



Costa percurrent or shortly excurrent, . 12. 



11. Capsule usually incurved; operculum small, persistent, 



mtermediitm. 

 Capsule regular ; lid larger; spores maturing earlier; 



leaf border more distinct, . . . cuspidatum . 

 Leaves decurrent ; synoicous, .... bitmtm. 



Leaves not decurrent, dioicous, . . turbinatum, 



Snyoicous; leaves decurrent, .... bimum. 



Dioicous, ........ 14 



Autoicous ; leaves scarcely decurrenti . pallescens . 



12. 



13- 



