EXPLANATION OF THE FIGURES. 447 



FIG. 



5. A young archegonium at the time of the dissolution of the transverse septa 



of the cells of the axile cellular string, X 300. 



6. Longitudinal section of an archegonium fit for impregnation, X 200. 

 C*. Transverse section of the neck of a similar archegonium, X 200. 



7. Similar view of au archegonium ready for impregnation and of a very young- 



one similarly magnified, X 200. 



8. Three-celled fruit-rudiment, detached, x 300. 



9". Group of three archegonia impregnated artificially, with two young abortive 

 archegonia, X 40. 



9*. Young fruit-rudiment, longitudinal section. 



10. Longitudinal section of a more developed fruit-rudiment, X 300. 



11. Longitudinal section of a young fruit, showing the commencement of the 



separation of the tissue of the interior of the capsule (about the 20th 

 August), x 150. 



12. Primordial utricle of a cell of the interior of a capsule in the same state 



of development, set free by the dissolution of the swollen substance of 

 the wall, x 200. 



13. Longitudinal section of a further developed fruit, x 40. In part of the 



interior of the capsule the arrangement of the elaters and spore-mother- 

 cells is visible (middle of September). 



14. Spore-mother-cell with protrusions (one turned away from the observer) of 



the wall ; on the 8th of September, x 500. 



15. The same, in which the cell-contents are not shown, x 500. 

 15^. The same, turned round 90, x 200. 



16. Mother-cell with four protrusions (one turned away) answering to the 



special-mother-cells. Beginning of December, x 400. 



17. A set of four spores just formed (one is turned away from the observer) 



which are held together by the remnants of the mother-cell. Middle of 

 December. X 400. 



18. A young spore still attached to the remnants of the mother-cell. In the 



place of the primary central nucleus (which in the spores shown in 

 Fig. 17, has already become dissolved) two new ones have been 

 formed. X 400. 



19. The same division has taken place in the two halves of the spore which is 



still attached to the remains of the mother-cell, x 400. 



20. Remnants of the mother-cell from which the spores have escaped, x 400. 



21. A septum is formed between the two nuclei dividing the spore into two 



halves, x 300. 



22. One of the two newly formed cells has divided again by a transverse 



septum, x 300. 



23. Outlines of the cells of a five-celled spore, x 400. On the 20th Decem- 



ber. 



24. A free spore similar to that in Fig. 7, X 400. 



25. A young spore, one half of which has become divided irregularly by an 



oblique septum, x 300. 



The originals of Figs. IS, 19, 20, 22 and 24, were taken from the same cap- 

 sule as the original of Fig. 17. 



