176 



BULLETIN OF THE tTNIVEKSITT OF WISCONSIN. 



Perichaetial and comal leaves similar. 

 Leaves faintly papillose, costa narrow, sometimes ex- 

 current A. Maconnii, SS. 



Leaves strongly papillose, costa 30-40/< wide, percurrent A. nivalis, 3S. 



ARCHIDIUM, p. 49. 



Autoicous. 



Costa reaching to point of leaf 

 Costa often long excurrent 

 Paroicous. 



Leaves serrulate ...... 



Leaves quite entire. 



Cells oval or rhombic .... 



Cells quadrangular or quadrate 



A. Ohioense, 50. 

 A. Hallii, 51. 1 



A. tenerrimnm, 50. 



A. Earenelii, 50 

 A. longifolinm, 50. 



MICROMITRIUM, p. 37. 



Spores 63^ diameter, leaves serrate . . M. megalospornm, 37. 



Spores 25/i diameter, nearly smooth, leaves serrate above M. Anstini. 37. 

 Spores a little smaller, papillose, leaves nearly entire M. synoicum, 37. 



EPHEMERUM, p. 37. 



Leaves not costate ...... 



Leaves costate. 



Costa ending below or at apex .... 



Costa excurrent. 

 Seta short, capsule acutely beaked 

 Seta wanting, capsule blunt pointed. 

 Leaves gradually long-accuminate, slightly 



irregularly serrate at apex 

 Leaves with a long hyaline spinul6se arista 

 Leaves papillose both sides 

 Leaves long-spinulose on both sides 



E. serratnm, 37. 



E. cohserens, 39. 



E. stenoplifllum, 39. 



and 



E. crassinervinin, 38. 



E. spinnlosum, 38 . 



E. papillosum, 38. 



E. hystrix, 38. 



SPHjERANGIUM, p. 40. 



Leaves papillose on both faces . . . S. Schimperiannm, 41. 



Leaves smooth, or papillose on back. 

 Margins reflexed, plants triquetrous . . .8. triquetrum, 41. 

 Margins almost plane, plants round or tetragonal. 



Lower leaves ecostate S. rufescens, 40. 



Lower leaves costate S. muticam, 40. 



iSee also Apiwndix, no. 34. 



