22 



VERMONT MOSSES. 



IVrUSCI PLEUROCARPI. 



I.— Internal peristome latticed; aquatic. Fontinalis. 



Internal peristome not latticed. 2. 



2. — Leaves strongly papillose. 25. 



Iveaves not papillose or very slightly so by reason of the thickening of angles of the 



cell walls. 

 3. — Peristome single. 



Peristome double, the inner often imperfect. 

 4.— Leaves distichous, lamina with an extra division at base. 



Leaves pluriseriate. 

 5. — Leaves ecostate. 

 Leaves costate. 

 6.— Segments short or none or obscured by adhering to the teeth. 

 Segments narrowly linear, often indistinctly keeled. 

 Segments lanceolate, distinctly keeled. 

 7. — Capsules straight. 



Capsules more or less curved. 

 8.— Segments adherent to the teeth. 



Segments not adherent to the teeth. 

 9. — Leaves costate. 



Leaves ecostate or costa short and double. 

 10. — Leaves costate, costa single. 



Leaves ecostate or costa short and double. 

 II.— Capsule symmetric, erect. 



Capsule unsymmetric, often arcuate, more or less inclined. 

 12. — Costa single, extending to the middle or beyond. 



Costa short and double or none. 

 13.— Plants dendroid. 



Plants not dendroid, creeping ; leaves complauate, pseudodistichous. 

 14.— *Leaf cells short i :3 or less. 



Leaf cells 1:3 or more. 

 15. — Plants stout, dendroid ; leaves coarsely serrate. 



Plants slender, creeping ; leaves entire or denticulate above. 

 16. — Costa single, extending to middle of leat. 



Costa short and double or none. 

 17. — Operculum long-rostrate. 



Operculum conic or very short-rostrate. 



3- 



4. 



6. 



Fissidens. 



5- 

 Leucodon. 

 Leptodon. 



7- 

 10. 

 II. 



8. 

 Homalothecium 



Q. 



Neckera. 



Homalothecium. 



Pylaisiella. 



Anacamptodon. 



Entodon. 



12. 



14. 



13- 



Entodon. 



Climacium. 



Homalia. 



15- 



16. 



Porotrichum. 



Amblystegium. 



17. 

 22. 

 18. 

 19. 



18.— Stem leaves deltoid or else papillose by the thickened angles of the cell walls. 



Eurhynchium. 



*Brachylhecium reflexum will be sought here. 



