THE BRYOLOGIST, 



A DEPARTMENT OF THE FERN BULLETIN, 



DEVOTED TO THE STUDY OF NORTH AMERICAN MOSSES. 

 ISSUED QUARTERLY. 

 EDITED BY DR. A. J. GROUT, Boy's HIGH SCHOOL, BROOKLYN, N. Y. 

 To whom all correspondence regarding the mosses should be addressed. 



This department is issued separately at twenty-five cents a year, by the 

 Fern Bulletin Co., Binghamion, N. Y. Subscriptions should be tnailed to this 

 address. 



Vol. ii. October, 1899. No. 4. 



KEY TO THE MNIUMS OF NORTHEASTERN NORTH 

 AMERICA. 



Leaves not bordered 3. 



Leaves bordered 2. 



Plants large, leaves entire or very slightly serrate by 



projecting cells; leaf cells twice as long as broad . 



M. cinclidioides . 



Plants much smaller, leaves usually serrate; leaf cells 



isodiametric (/. e., as broad as long) . . M. stcllare. 



Leaves entire 7. 



Leaves serrate, with single teeth 4. 



Leaves serrate, with teeth in pairs 11. 



Leaves costate to apex . . . . ' . . M. punctatum. 

 Costa vanishing below apex 5. 



Upper leaf cells isodiametric . . . M. hymenophylloides. 



Upper leaf cells longer than broad 6. 



Margin of leaves thickened, of 2-4 layers; dioicous; cap- 

 sule oval M. punctatum, var. elatum. 



Margin of leaves not thickened ; synoicous ; capsule round- 

 ish M. pseudopunctatum . 



Basilar branches stoloniform ; capsules single or clustered. 8. 



Basilar branches erect or stems simple; capsules clus- 

 tered . . M. Drummondii. 



Leaves rounded at apex, mucronate ; operculum rostrate. 

 M. rostratum. 



Leaves acuminate ; operculum mamiliate or apiculate. . 9. 



Leaves serrate to base, teeth usually more than one cell 

 in length 10. 



Leaves serrate to middle, teeth consisting of a single cell. 

 M. sylvaticum . 



Dioicous; operculum mamiliate . . . M. cuspidatum. 



Synoicous; operculum apiculate .... M. medium. 



