SYNOPSIS OF ORDERS AND GENERA. 51 



Genus 36. Dissodon. — Apophysis tapering ; columella ex- 

 serted when dry ; peristome of sixteen short double teeth 

 incurved when dry. 



Genus 37. Tayloria. — Apophysis clavate or subpyriform ; 

 teeth sixteen or thirty-two, reflexed when dry. 



Genus 38. Tetraplodon. — Apophysis clavate or ovate ; peri- 

 stome of sixteen double teeth, at first approximated in fours, 

 reflexed when dry. 



Genus 39. Splachnum. — Apophysis large, spongy, distinct ; 

 teeth sixteen, in pairs, reflexed when dry. 



Order XII. DISCELIEI. 



Sporangium subglobose, cernuous; ring large; teeth six- 

 teen, cloven from the base ; veil twisted. 

 Genus 40. Discelium. 



Order XIII. OREADEI. 



Sporangium small, subglobose, cernuous; peristome single, 

 or obscurely double ; veil cucullate. 



Genus 41. Catoscopium. — Sporangium even, horizontal ; pe- 

 ristome of sixteen short teeth, with traces of an inner peristome. 



Order XIV. BABTBAMIET. 



Sporangium spherical, mostly striated ; leaves rigid, keeled, 

 toothed. 



Genus 42. Conostomum. — Peristome of sixteen teeth, united 

 at their tips and forming a cone. 



Genus 43. Bartramia. — Sporangium oblique ; veil small, 

 fugacious ; peristome double, single, or absent. 



Genus 44. Bartramidula. — Sporangium even; mouth small ; 

 peristome none; spore-sac united above with the columella. 



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