— 66 — 



Fig. 16. Leaf base showing origin of protonema and the formation of 



a new leafy shoot. x 80, 

 „ 17. The basal half of a leaf, showing origin of protonema from 



both the proximal and the distal ends. x 80. 

 „ 18. Jip of a leaf showing protonema growing from the cut edge. 



x 80. 

 „ 19. Protonema and leaf cells from the preceding on a larger scale. 



x 195. 

 „ 20. Protonema originating directly from the defoliated stem. x 195. 

 „ 21. Paraphysis which has grown out into a protonema filament. 



BBYUM ARGEN TEUM. 



„ 22. Leaf with protonema. x 80. 



„ 23. A few of the marginal leaf cells showing the origin of the 



protonema. x 195. 

 „ 24. Leaf with protonema. x 80. 

 „ 25. A few of the basal cells showing the origin of the protonema. 



x 195. 

 „ 26. Portion of a defoliated stem showing the origin of protonema 



and the formation of buds. x 195. 



BARBULA MURALIS. 



„ 27. Basal portion of a leaf showing the origin of protonema. x 195. 

 „ 28. Portion of a leaf protonema showing a bud with rudimentary 



leaves. x 195. 

 „ 29. Protonema with rhizoids which have been produced in light 



in a ten weeks old culture. x 195. 



ATBICHUM UNDULATUM. 



„ 30. Protenema grown from the leaf and showing the aggregated 

 branching so common in the leaf protomena of Atrichum. x 195. 



„ 31. Portion of a protonema with bud. x 195. 



„ 32. Cross section of a leaf showing the manner in which the proto- 

 nema originate from the cells at the base of the outer lamellae. 

 x 195. 



POLYFRIGBUM COMMUNE. 



„ 33. Diagram of a leaf which has produced protonema and a leafy 



shoot. x 8. 

 „ 34. Portion of a cross section of a leaf showing the origin of a 



protonema from a cell at the base of a lamella. x 330. 

 „ 35. A bud produced direct by the end cell öf the main protomena 



axis. x 330. 



