28 



VERMONT MOSSES. 



8.— Leaves falcate. 



Leaves not falcate. 

 9. — Leaves acute or short apiculate, alar cells few, large. 



Leaves obtuse, alar cells hyaline. 

 10. -Plants terrestrial, bright j'ellow-green. 



Plants subaquatic, dark or dirty green. 

 II.— Plants very large 10-25 cm. long, dioicous; leaves oblong-ovate. 



Plants smaller 5-10 cm.; inonoicous; leaves ovate. 

 12. — Costa single, reaching the middle or beyond. 



Costa short and double or none. 

 13. — Leaves transversely rugose. 



Leaves not rugose. 

 14. — Plants slender. 



Plants very stout. 

 15. — Paraphyllia abundant. 



Paraphyllia none. 

 16. — Leaves plicate. 



Leaves not plicate. 

 17. — Annulus none. 



Annulus present, often large. 

 18. — Leaves quite entire, short acuminate. 



Leaves denticulate, subulate acuminate. 



Leaves acute or bluntish. 



Leaves gradually long acuminate. 



Leaves broad (i — 1.5 mm.), crumpled and plicate when dry. 



Leaves narrower (0.5 — i mm.), not crumpled when dry. 

 21. — Leaves denticulate. 



Leaves entire. 

 22. — I^eaves auricled. 



Leaves not auricled. 

 23.— Leaves plicate ; plants pale green or shining yellow, 



Leaves smooth; plants brown, purple, or blackish. 

 24. — plants regularly pinnate. 



Plants irregularly branched. 

 25.— Capsule costate and arcuate when dry. 



Capsule not costate. 

 26. — Leaves serrate or denticulate all around. 



Leaves serrate or denticulate only above the middle. 



19' 



20. 



eugyrium. 



9- 



palustre. 



cuspidatum. 



Schreberi. 



II. 



scorpioides. 



molle. 



13- 

 24. 



M- 



15- 



aduncum gracilescens. 



rugosum. 



16. 



17- 



commutatum. 



lilicinum. 



18. 



19. 



palustre. 



fluitans. 



ochraceum. 



20. 



Wilsoni. 



21. 



uncinatum. 



22. 



aduncum. 



23- 



vernicosum. 

 revolvens. 



25- 



29. 



curvifolium. 



26. 



27- 



28. 



