b VERMONT MOSSES. 



22. — Leaves distichous. 23. 



Leaves pluriseriate. 24. 



23. — Leaves subulate. Swaartzia. 



Leaves broader, lamina with an extra division at base. Fissidens. 



24. — Capsule unsymtnetric, cernuous-inclined or arcuate. 25. 



Capsule symmetric, erect. 30. 



25. — Teeth irregularly lacerate or bifid to the middle or below. 26. 



Teeth bifid almost to the base.* Ceratodon. 



26. — Leaf cells not enlarged at basal angles, roundish or ijuadrate above. 27. 



Leaf cells not enlarged at basal angles, oblong above, rectangular at base. 29. 



Leaf cells enlarged-quadrate at basal anjjles. _ 28. 



Leaf cells of 2 kinds in 2 or 3 layers. Leucobryum. 

 27.— Leaves narrow, acuminate, basal cells rectangular; peristome=J4capsule. Oncophorus. 



Leaves larger, acute, lower lateral cells quadrate; peristome shorter. Dichodontium. 



28. — Leaf cells linear at base; capsule not strumose. Dicranum. 



Leaf cells rectangular at base, capsule strumose. Oncophorus. 



29. — Costa broad, flattened and indistinct below; cells of exothecium irregularly oblong 

 and curved, with flexuose walls. ' Dicranella. 



Costa narrow and well defined below; cells of exothecium regularly rectangular- 

 quadrate, with non-flexuose walls. Anisolhecium. 



30. — Teeth bifid to the common membranous base. 31 . 



Teeth deeply bifid or cleft to the base, free. 32. 



Teeth cribrose, perforate or slightly cleft.** 33. 



Teeth entire. 34- 



31. — Leaves smooth, naked. Ditrichum. 



Leaves smooth, covered at back with a glaucous granular-filamentose excretion. 



Saelania. 



32.— Leaf cells not enlarged at the angles, oblong above. Dicranella. 



Leaf cells not enlarged at the angles, roundish or quadrate above. Oncophorus. 



Leaf cells enlarged, quadrate or rectangular at the angles. Dicranum. 



33.— Seta little exceeding the often hair-pointed leaves. Grimmia. 



Seta long ; leaves not hair-pointed. Barbula rubella and Mollia tenuirostris. 



34. — Capsule with a long, thick apophysis. Tetraplodon. 



Capsule without apophysis. 35. 



35. — Capsule short-pyriform, turbinate when dry. 36. 



Capsule ovate-globose. Drummondia. 



36.— Teeth of peristome blunt. Seligcrla. 



Teeth acute. Blindia. 



* Tremalodon belongs here. 

 **Slindia acuta may be sought here. 



