EXPLANATION OF FIGURES. 



PLATE IX. 



All figures X 500. 



Fig. 1. Two spores of Ophioglossum 

 moluccanum showing the range in 

 size. 



Pig. 2. Two-celled stage of 0. moluc- 

 canum. 



rig. 3. First stage of germination of a 

 spore perhaps belonging to another 

 species. 



Figs. 4, 5. Two older stages of 0. moluc- 

 canum. Fig. 4 shows two chloro- 

 plasts; sp. spore-membrane. 



Fig. 6. A four-celled prothallium of 

 O. moluccanum., seen in transverse 

 optical section. 



Fig, 7. Two views of a similar stage. 



Fig. 8. Two transverse optical sections 

 of a four-celled prothallium. 



Fig. 9. Three-celled prothallium of 0. 

 intermedium. 



Figs. 10, 11. Two germinating spores of 

 0. pendulum. 



Figs. 12—17. Older prothallia of 0. pen- 

 dulum, showing the infection by the 

 mycorhiza, m. Fig. 1.5 is a surface 

 view of 14, and 16 a similar view 

 of 17. 



PLATE X. 



Fig. 18. Two views of a young pro- 

 thallium of 13 cells, of pendulum., 

 m. mycorhiza; x, apical cell (?) x 500. 



Fig. 19. Three transverse (optical) sections 

 of a similar prothallium ; x, apical 

 cell (?). 



Fig. 20. The same prothallium as in 

 Fig. 19, seen from the side. 



Fig. 21. Adult gametophyte of 0. moluc- 

 canum t, basal tuber; cT, antheri- 

 dia: xlO. 



Pig. 22. Prothallium, pr. of the same 

 species with young sporophyte; 1, 

 cotyledon, r, root; x5. 



Pig. 23. Prothallium of probably another 

 species, x 3. A bud (k) is visible at 

 the base of the first root of the young 

 sporophyte. 



Pig. 24. Another prothallium of probably 

 the same form. 



Figs. 25, 26. Two prothallia of 0. moluc- 

 canum., with young sporophytes at- 

 tached, x5. 



Fig. 27. Prothallium of 0. moluccatinm, 

 with sporophyte attached ; the leat 

 (1^) of the definitive sporophyte is 

 seen arising from the primary root, 

 r'. x5. 



Fig. 28. Prothallium of 0. moluccanum., 

 with two independent sporophytes, 

 x3. 



Fig. 29. Part of a prothallium of 0. 

 moluccanum, with attached sporo- 

 phyte showing fully developed coty- 

 ledon 1, x3. 



Figs. 30, 31. Two prothallia of 0. sp.? 

 from Hakgala, Ceylon, x5. 



Fig. 32. Prothallium and young sporo- 

 phyte of 0. »wluccanum{T)-, broad 

 leaved form, Buitenzorg, x3. 



