192 BOTANICAL GAZETTE [September 



EXPLANATION OF PLATES IX-XII 



* 



Fig. i. — Sketch of dioecious thallus. 



Fig. 2. — Vertical longitudinal section through apical cell; X505. 

 Figs. 3-8. Serial horizontal section through apical cell; X830. 

 Fig. 9. — Horizontal section of thallus, showing two apical cells; X505. 

 Figs. 10, 11. — Horizontal section of thallus showing two apical cells in one 

 sinus; X830. 



Fig. 12. — Young mucilage hairs; X830. 



Fig. 13. — Young rhizoid with chloroplasts present; X830. 



Fig. 14. — Young rhizoid infected by fungus from within; X830. 



Fig. 15. — Rhizoids with and without fungus, showing irregular form; 



X175. 



Fig. 16. — Vertical section through antheridium initial; X505. 



Fig. 17. — Vertical section, showing antheridium initial divided into stalk 



and antheridium proper; X830. 



Fig. 18. — Vertical section through antheridium, showing first vertical 



wall; X soS- 

 Fig. 19. — Stages of development in antheridium, showing wall and 



spermatogenous cells defined; X505. 



Fig. 20. — Vertical section through antheridium, showing early divisions of 



the spermatogenous cells; X830. 



Figs. 21-24. — Horizontal sections through the antheridium, showing its 



development; X1650. 



Figs. 25, 26. — Vertical sections through older antheridia, showing stalk 



cells, and fig. 26 showing the development of the tissue around the antheridium; 



X505. 



Fig. 27. — Stages of development in the sperm; X2800. 



Fig. 28. — Horizontal section through an archegonial branch, showing 

 numerous archegonia; X505. 



Fig. 29. — Vertical section through young archegonium; X830. 



Fig. 30. — Vertical section through older archegonium ; X 830. 



Fig. 31. — Horizontal section through archegonial neck; X830. 



Fig. 32. — Vertical section through mature archegonium; X830. 



Fig. 2,3^ — Vertical section through archegonium, showing canal cells dis- 

 organized; X830. 



Fig. 34. — First division of the young sporophyte; X 1040. 



Fig. 35.— The haustorial cell of the sporophyte, well elongated, and 

 gametophyte cells disorganizing; X1040. 



Fig. 36. — Haustorial cell more elongated ; the sporophyte proper composed 

 of four cells; X 1040. 



Fig. 37. — Foot, seta, and capsule region of the sporophyte marked out; 

 X 1040. 



