158 BULLETIN OP THE UNIVERSITY OP WISCONSIN. 



B. Green protonema not persistent. 

 Margins of leaves flat or incurved. 

 Leaves lance-obovate to broad ovate or ovate lanceolate, 



not abruptly pointed. 



Margins dentate or serrate . . . Physcomitrella, 39. 

 Margins entire ... . . . , . Toitia, 42, 43. 



Leaves linear-lanceolate to subulate or abruptly pointed. 



Calyptra mitrate Bruchia, 45. 177. 



Calyptra cucullate Pleuridium, 43. 177. 



[Astomum, may be sought here.] 



Margins of leaves more or less revolute. 



Capsule spherical Spluerangium, 40. 176. 



Capsule short-pointed. 



Calyptra mitrate Microbryum, 45, 37. 



Calyptra cucullate Phascum, 41. 177. 



II. STEGOCARPI. Capsule with a deciduous operculum. 



A. ACROCABPI. Capsule at the apex of the stem, either the main 

 shoot or a well developed branch. (B on p. 166.) 



i. Mouth of the capsule naked. (2 on p. 159.) 

 [Weisia viridula vars. may be sought here.] 



* Leaf-cells isodiametric, at least above the middle of the leaf, often 



obscure. (* * on p. 159.) 



Lid imperfectly formed, persistent . . . Astomum, 51. 1 78. 

 Lid perfect, deciduous. 

 Capsule immersed. 



Leaves lamellose Pharomitrium, 100. 



Leaves not lamellose. 



Apex hyaline or prolonged into a hyaline hair. 

 Perichaetial leaves ciliate .... Hedwigia, 152. 

 Perichaetial leaves not ciliate . . . Grim mi a, 134. 197. 

 Apex obtuse, plants robust, blackish . Scouleria, 137. 197. 



Capsule exserted, ribbed when dry. 

 Calyptra cucullate. 



Leaves with long hyaline points . . . Brannia, 152. 

 Leaves not hyaline pointed. 



Capsule contracted below the orifice Amphoridium, 158. 201. 

 Capsule not contracted below the orifice . Zygodon, 206. 201. 

 Calyptra campanulate-mitrate, plicate, usually 



hairy . ... . . Macromitrium, 178. 206. 



