240 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



Leaves acute or short acuminate. 

 Dioicous, leaves obovate or subrotund . B. NoTse-Cesarese, 356. 



Monoicous, leaves broEidly ovate to ovate or oblong lanceolate. 



Leaves decurrent K. Roellii,' 508. 



Leaves not decurrent. 



Margin strongly reflexed . . . . K. Ee^eliannm, 507. 

 Margin plane K. mieans,^ 365. 



RHYNCHOSTEGIUM, p. 358. 



Pedicel rough K. curvisetum, 360. 



Pedicel smooth. 



Costa single, reaching half way or more. 

 Leaves apparently 2-ranked, plants of dry woods K. serrulatum, 359. U 

 Leaves spreading every way . . . . R. ruscifonne, 359. > 

 Costa very short or none or double. 

 Bicostate, annulus large .... R. geophilum, 358. 



Uni- or ecostate, annulus none . . . R. deplanatnm, 359. 



Sypnum Caloosiense Aust., S. Boyce Aust., and JI. Brandegei 

 Aust., insufficiently established and of uncertain relationships, are not 

 included in this key. 



THAMNIUM, p. 361. 



Branch and stem leaves apparently 2-ranked, complanate. 

 Capsule oblong, without collum ... T. Holzingeri, 511. 



Capsule oval, with a distinct collum . . . T. Bigelovii, 362. 

 Branch and stem leaves equally spreading. 

 Perichaetial leaves reflexed. 



Cilia equaling teeth T. Leibergii, 510. 



Cilia short T. neckeroides, 362. 



Perichaetial leaves erect. 



Teeth with a hyaline, dentate margin . T. alopecnrnm, 609. 



Teeth not hyaline margined and toothed only at the 



articulations T. Alleghaniense, 362. '^ 



1 R. Roellii is mcladed Tinder both heads since the character of the operculnm is un- 

 known to me, 



' R. micans H. & C. Eev. BryoL 80: 21. 1893 = Hypnum mieans Sw. L. & J. Man. 365. 

 See also Appendix, no. 5<^. 



