I;i0 Best : Revision of the North American 



2. Hetcrocladinm liomoeoptcrum C. M. & K., distributed as Can. 

 Muse. 484, is H. procurrens. 



3. Heterocladium fridlaniopsis C. M. & K. Cat. Canadian 

 Plants 6 : 183. 1892. Mr. John Moser, who is credited with the 

 collecting of this species at Canaan Forks, N. B., writes me that 

 Professor Macoun is unable to find it in his collection and that he 

 has not succeeded in getting a specimen from Dr. Kindberg but 

 kindly sends what he supposes to be a duplicate of the type. 

 This is a rather stout form of Pterigynandrum jiliforme, approach- 



I 



ing the var. decipiens. 



Explaiiationof Plates 



These plates were drawn from a magnification twice as great as expressed in 

 the numbers which represent the magnification of the figures as they stand in the re- 

 production. 



Plate 13. Heterocladium procurrens 



1. Plant, natural size. 



2. Portion of stem showing arrangement of leaves. X l l 

 3f 4> 5- Outlines of stem leaves. X IX 



6. Basal portion of stem leaf. X &7K- 



7. Cells from middle portion of stem leaf. X ^7K« 



8. Cells from center of stem leaf; showing the two veins the walls of which are 

 shaded. X I2 °- 



9. Apex of stem leaf. X %7 l /z' 



10. Paraphyllium. X 57^- 



11. Paraphyllium showing width of walls. X &7H- 



12. Ultimate branch showing arrangement of leaves. X IJ 



13. Leaf from ultimate branch. X I 5- 



14. Basal portion of branch leaf. X %7 l A- 



15. Apex of same. X %7%- 



16. Capsule (drawn dry). X^ 



17. Operculum. X 8. 



Heterocladium squarrosulum 



18. Plant, natural size. 



19. Portion of primary stem showing arrangement of leaves. X l %}4 

 20,21. Outlines of primary stem leaves. X l %%* 



22. Basal portion of primary stem leaf. X I2 °- 



23. Apex of same. X I2 °- 



24. Central cells from primary stem leaf. X 2 °7/^- 



25. Marginal cells from the same. X 2 °7}4- 



26. Paraphyllium showing cells. X %7}4- 



27. 28. Paraphyllia. X 45- 



29, 30. Outlines of secondary stem leaves. X J 8^. 



31. Apex of secondary stem leaf. X I2 °- 



32. Cross section of secondary stem leaf showing papillae. X 2 7°* 



