58 HANDBOOK OF BRITISH MOSSES. 



Genus 88. Pottia. — Veil cucullate; peristome none; apex 

 of columella falling away with the lid. 



Oedeb XXX. DICRANEI. 



Sporangium even or striate; peristome of sixteen bifid, often 

 transversely-striate teeth ; veil cucullate, entire, or fringed. 



Genus 89. Campylopus. — Sporangia mostly aggregate ; 

 fruitstalk curved or geniculate ; veil fringed ; teeth lanceolate ; 

 leaf-cells subquadrate. 



Genus 90. Dicranodontium. — Sporangium even ; fruitstalk 

 curved ; veil not fringed ; upper leaf-cells narrow. 



Genus 91. Ceratodon. — Sporangium erect, furrowed; peri- 

 stome of sixteen deeply cloven teeth, connected below bytrans- 

 verse processes ; upper leaf-cells minute. 



Genus 92. Trichodon. — Fruitstalk flexuous; sporangium 

 even ; peristome of sixteen teeth divided to the base ; articu- 

 lations nodose ; leaf-cells rectangular. 



Genus 93. Leucobryum. — Sporangium striate ; peristome of 

 sixteen bifid trabeculate teeth ; outer leaf-cells perforated. 



Genus 94. Dicranmn. — Sporangia aggregate or single in 

 the same perichsetium ; teeth sixteen, striate and trabeculate ; 

 upper leaf-cells linear. 



Genus 95. Dicranella. — Sporangium mostly cernuous ; veil 

 slightly inflated ; peristome regular ; upper leaf-cells oblongo- 

 hexagonal ; stems normally short. 



Genus 96. Dichodontium. — Sporangium roundish, without 

 any apophysis; fruitstalk flexuous; teeth bi-trifid; articula- 

 tions crowded, prominent ; upper leaf-cells very minute, quad- 

 rate, papillose. 



Genus 97. Cynodontium. — Sporangium oblique or sym- 

 metrical; veil rather large; teeth lanceolate, dilated at the 

 base, cloven, often irregular; upper leaf-cells minute; lower 

 rectangular ; all chlorophyllous. 



