292 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VOL. V. 



Plate II. 



Fig. 21. — Base of a broken root-hair; s, cutinized sheath ; d, hypha of penetrating- 

 fung-us. X 1,000. 



Fig. 22. — a, formation of conidium ; d, ripe conidiuin ; c, g^erminating- conidium. 

 X 1,000. 



Fig. 23. — Antheridial ridge showing three antheridia in different phases of develop- 

 ment, a^, a^, and «■'. x 250. 



Fig. 24, — An older antheridum. x 250. 



Fig. 25. — A still older phase in which the outer wall is undergoing division. x 250. 



Fig. 26. — Antheridial ridge showing the formation of paraphyses, /«;■. x go. 



Fig. 27. — Development of antherozoids ; a, young sperm-cells. x 500. d, definite 

 spermatic mother-cells ; c, a later phase of the same, the nucleus is beginning to 

 become crescentic ; d, young antherozoids within the mother-cells ; e, ripe antherozoid. 

 In e'^, the protoplasmic vesicle is still retained ; in e^, it has disappeared. x 1,000. 



Fig. 28. — Matured antheridia showing the doubled outer wall ; within, the anthero- 

 zoids are swimming in a gelatinous matrix. In a, they are escaping, x 250. 



Fig. 29. — First stage in formation of the archegonium. x 250. 



Fig. 30. — A later phase showing formation of the basal cell. x 250. 



Fig. 31. — Anticlinal division of the cervical rudiment. x 250. 



Fig. 32. — Periclinal divisions of the cervical portion of the archegonium. x 250. 



Fig. 23- — Nuclear division of the axial cell. x 250. 



Fig. 34. — The same completed. A paraphysis at a. x 250. 



Fig. 35. — Nuclear division of the cervical canal-eel x 250. 



Fig. 36. — The same completed. x 250. 



Fig. 37. — Ripe archegonium, showing the ventral canal-cell. x 250. 



Fig. 38. — Opened archegonium with penetrating'antherozoid. x 500. 



Fig. 39. — Fertilized egg. x 250. 



Fig. 40. — The same older and larger. x 250. 



Fig. 41. — First division of the embryo. x 250. 



Fig. 42. — Formation of the median wall of the embryo. x 250. 



Fig. 43. — An older embryo in which anticlinal divisions are present in the upper 

 octants. X 250. 



Fig. 44.— Another .embryo of the same age, with oblique walls. x 250. 



Fig. 45. — The same age as the foregoing, showing irregular segmentation. x 250. 



Fig. 46. — A more advanced phase showing periclinal activity in the upper cells of 

 the young embryo at a ; (^ is the foot region. x 250. 



