456 EXPLANATION OF THE FIGURES. 



PIG. 



3, 4. Longitudinal moieties of more developed buds, seen from the surface, 



X 300. 

 5. Half of the fore-edge of a more advanced bulbil, X 300. 



7. Bud, whose upper part is beginning to widen, seen from the surface, X 50. 



8. The cells of an indentation of a lateral margin of the latter bud, X 300. 



9. Bud which has rooted and is beginning to sprout, X 15. 



10. Longitudinal section through a shoot bearing the rudiment of a fruit (be- 



ginning of April), X 50. 



11. Head of young fruit from below (end of May), X 100. 



12. More advanced fruit in longitudinal section, X 100. 



13. 14. Longitudinal section of impregnated archegonia, x 300. 



15. Impregnated archegonium, enclosing a four-celled fruit-rudiment, and 



which together with its special covering has been laid open by a longi- 

 tudinal section grazing the fruit-rudiment. 



16. Margin of a growing disk of antheridia (end of November) in longitudinal 



section, X 300. 



17. Transverse section of the stem of a developed antheridial disk, x 100. 



Bigs. 18 — 20. Lunularia vulgmis. 



18. Longitudinal section perpendicular to the surface, of a very young shoot, 



X 300. 



19. Similar section of the end of a young shoot bearing the rudiment of a bud- 



receptacle. 



20. End of a shoot, x 5. 



Bigs. 21 — 28. Targionia hgpophylla. 



21. Longitudinal section, perpendicular to the surface, through a shoot whose 



fore-end bears archegonia, enclosed by the rudiment of the veil, X 100. 



22. Similar section of a recently impregnated archegonium, X 300. 



23. Longitudinal section of an archegonium enclosing a multi- cellular fruit- 



rudiment, x 300. 



24. Young fruit-rudiment detached, 24 4 is the same turned 90° round its longi- 



tudinal axis, x 300. 



25. Longitudinal section of a more developed fruit-rudiment detached, X 500. 



26. Similar section of a more developed fruit-rudiment, X 300. 



27. Spore-mother-cell still exhibiting its primary nucleus, X 400. 



28. Spore-mother-cell in which the four secondary nuclei have been produced, 



and having projecting ridges upon the inner surface of the cell-mem- 

 brane, x 400. 



29. Young elater from the same fruit as that which produced the mother-cell 



shown in fig. 27, X 400. 



30. Young elater from the fruit which produced the spore-mother-cell shown in 



fig. 28, x 400. 



