SYNOPSIS OF ORDERS AND GENERA. 53 



double, inner with intermediate cilia; paraphyses of anthe- 

 ridia clavate ; leaves large. 



Genus 53. Zieria. Sporangium gibbous behind; neck 

 long ; inner peristome longer ; intermediate cilia rudimentary. 



Genus 54. Anomobryum. Sporangium symmetrical; peri- 

 stome double ; leaf-cells very narrow above, vermiform to- 

 wards the nerve. 



Genus 55. Bryum. Sporangium symmetrical, confluent 

 with the narrow apophysis ; paraphyses of antheridia filiform, 

 innovations from the apex ; leaf-cells rather large. 



Genus 56. Webera. Sporangium symmetrical, confluent 

 with the narrow apophysis; innovations mostly from the base; 

 stems mostly slender; leaves narrow; leaf-cells hexagonal, 

 elongated. 



Genus 57. Leptobryum. Sporangium symmetrical, con- 

 fluent with the narrow apophysis; innovations from the base; 

 leaves very narrow; leaf-cells above hexagonal, elongated. 

 Annual. 



Genus 58. Orthodontium. Sporangium symmetrical; spore- 

 case small; peristome double; inner without intermediate 

 cilia ; leaves very narrow. 



Genus 59. Aulacomnion. Sporangium furrowed, when dry; 

 spores very small. 



Genus 60. Timmia. Sporangium symmetrical ; peristome 

 double ; inner divided halfway into about sixty-four cilia, at 

 first united above. 



ORDER XVIII. POLTTEICREL 

 Sporangium often quadrate ; mouth mostly closed with a 



tympanoid membrane connected with the teeth or wall; veil 



mostly rough with dependent hairs. 



Genus 61. Polytrichum. Sporangium angular, with a dis- 



