192 



PLATE XI. 



Figs. 23, 43, 44, 0. moluccanum ; 

 the others, 0. pendulum. 



Fig. 33. The youngest prothalUiim that 

 was found of 0. moluccanum, x65, 

 t, basal tuber; rh, rhizoids. 



Figs. 34z-4:2. Various forms of the 

 prothalHura of 0. pendulum x3. 

 Figs. 34, 40, 41, and 42, show the 

 attached sporophyte. In Fig. 41, a 

 rootlet, r, is developing from the 

 primary i-oot. 



Fig. 43. A nearly median section through 

 the apex of a young prothallium of 

 0. moluccanum, xG5. A two-celled 

 embryo, em, is present. 



Fig. 44. The apical region of the same 

 x275. 



Fig. 45. Longitudinal section through a 

 portion of a large prothallium of 

 0. pendulum, x25. The dotted areas 

 show the distribution of the endo- 

 phyte; ^, empty antheridia. 



Fig, 46. A cross-section of a branch of 

 a similar prothallium, x25. 



Fig. 47. Apical cell of a branch of the 

 prothallium, in longitudinal section, 

 x275. 



Fig. 48. Unicellular hair from the sur- 

 face of the prothallium of 0. pen- 

 dulum, x275. 



PLATE XIL 



Fig. 49. Section of the tuberous base 

 of the prothallium of 0. moluccanum, 

 x65. r-' an old antheridium. 



Fig. 50. Outer cells of the tuber, showing 

 the endojjhyte, x275. 



Fig. 51. A rhizoid, showing penetration 

 of the mycoi'hiza, x275. 



Figs. 52, 53. Hhizoids from prothallium 

 of O. moluccanum, x275. 



Fig. 54. Transverse section of a pro- 



thallial branch of 0. pendulum, x65. 

 /, antheridium; 9 archegonium. 



Fig. 55. Two cells from near the apex 

 of a prothallial branch of 0. pen- 

 dulum, before the invasion of the 

 endophyte, x480. 



Figs. 56, 58. Cells infected by the endo- 

 phyte, x275. 



Figs. 59 — 61. Oogonium-like bodies of 

 the endophyte, x480. 



PLATE XIIL 



Figs. 62, 63. Young antheridia of 0. 

 moluccanum; longitudinal sections, 

 x480. 



Figs. 64, 65. Two older antheridia, 

 x275; 0, opercular cell. 



Fig. 66. An older antheridium ; surface 

 view, x275; o, opercular cell. 



Fig. 67. Transverse section of the apex 

 of a prothallial branch of 0. pen- 

 dulum, x275, X, the apical cell. 



Fig. 68. Longitudinal section of the apex 

 of a prothallial branch of the same 

 species, .showing the apical cell, x, 

 and two young antheridia, x275. 



Fig. 69. Longitudinal section passing 

 through three nearly full-grown 

 antheridia, x65. 



Figs. 70-72. Young antheridia of 0. 

 pendulum in longitudinal section, 

 x275. 



PLATE XIV. 



Figs. 73, 74. Young antheridia of 0. pen- 

 dulum, longitudinal sections, x275; 

 in 73, the nuclei are dividing. 



Figs. 75, 76. Two transverse sections 

 of a young antheridium of 0. pen- 



dulum, x275. Fig. 75 shows the sur- 

 face view. 

 Fig. 78. Surface view of a nearly full 

 grown antheridium of the same spe- 

 cies; 0, the opercular cell, x271. 



