a 
1903] ODONTOSCHISMA MACOUNII AND ITS ALLIES 347 
Fig. 23. Cells from middle of perianth. x 280. 
Fic. 24. Cells from mouth of perianth. Xx 280. 
Figs. 25-27. Perigonial bracts. x 45. 
IG. 28. Gemmae. X 400. 
Figs. 9, 11 and 12 were drawn from Minnesota specimens collected by 
Holzinger; the remaining figures were all drawn from the Yukon specimens 
collected by Macoun. 
PLATE XIX. 
FIGS. 29-34. Odontoschisma Gibbstae Evans. 
FiG. 29. Part of stem, gemmiparous and with three-ranked leaves 
above. xX 18. 
Fig. 30. Part of stem, postical view. X 18. 
Fic, 31. Median leaf-cells. x 350. 
Fic. 32. Marginal leaf-cells. x 250. 
Fic. 33. Young underleaf. x 250. 
F1G. 34. More mature underleaf. X 250. 
The figures were all drawn from the type specimens. 
Fics. 35-38. Odontoschisma denudatum (Mart.) Dumort. 
F1G. 35. Median leaf-cells. x 350. 
The figures were drawn from Connecticut specimens collected by the 
writer. 
Figs. 39-41. Odontoschisma Sphagni (Dicks.) Dumort. 
FIG. 39. Median leaf-cells. X 350. 
Fig. 40. Marginal leaf-cells. x 350. 
Fic. 41. Underleaf, antical view, not showing the slime-papillae on the 
postical surface. X 250. 
The figures were drawn from specimens distributed in Gottsche and 
Rabenhorst’s Hep. Eur. 399. 
FIGs. 42-54. Odontoschisma prostratum (Swartz) Trevis. 
Fig. 42. Part of a plant bearing a postical branch with perianth and a 
postical sterile branch. x 18. 
Fig. 43. Part of stem, antical view. x 18. 
Fic. 44. Part of stem, lateral view, showing flagella. < 18. 
FIG. 45. Male inflorescence, antical view. 40. 
Fics. 46-48. Perichaetial bracts and bracteole, innermost row. X 18. 
FIGs. 49-51. The same, second row. X 18. 
Figs. 52-54. The same, third row. X 18. 
