240 BULLETIN OF THE UNIVERSITY OF WISCONSIN. 



Leaves acute or short acuminate. 



Dioicous, leaves obovate or subrotund . R. NoyaB-Cesareae, 356. 

 Monoicous, leaves broadly ovate to ovate or oblong lanceolate. 



Leaves decurrent R. Roellii, 1 508, 



Leaves not decurrent. 



Margin strongly reflexed . . . . K. Kegelianum, 507. 

 Margin plane R. micans, 2 365. 



RHYNCHOSTEGIUM, p. 358. 



Pedicel rough . R. curvisetum, 360. 



Pedicel smooth. 



Costa single, reaching half way or more. 



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

 Leaves spreading every way . . . . R. rusciforme, 359. 

 Costa very short or none or double. 



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



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



Hypnum Caloosiense Aust., If. Royce Aust., and H. 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. 

 Perichsetial leaves reflexed. 



Cilia equaling teeth T. Leibergii, 510. 



Cilia short T. neckeroides, 362. 



Perichaetial leaves erect. 



Teeth with a hyaline, dentate margin . T. alopecurum, 509, 



Teeth not hyaline margined and toothed only at the 



articulations T. Alleghaniense, 362. 



i R. Roellii is included under both heads since the character of the operculum is un- 

 known to me. 



* R. micans R. & C. Rev. Bryol. 20: 21. 1893 = Hypnum micans Sw. L. & J. Man. 365. 

 See also Appendix, no. 505. 



