io8 Humphrey. — Fossombronia longiseta, Aust. 
Fig. 1 6. Spirem stage of nucleus in cells from which the spermatid mother-cells arise. Stained 
with iron haematoxylin and safranin. x 2400. 
Fig. 17. Metaphase in division of cells of the age of those represented in Fig. 16. Stained with 
Flemming’s triple stain, also with iron haematoxylin. x 2400. 
Fig. 18. A spindle viewed en fare showing chromosomes, x 2400. 
Fig. 19. A group of spermatid mother-cells ; nuclei in resting-stage, though the chromatin is 
appearing and the nuclei are about to pass into the spirem condition. No blepharoplast apparent. 
Stained with iron haematoxylin and safranin. x 2400. 
Fig. 20. Spirem stage of spermatid mother-cell. Stained with Flemming’s triple stain, x 1750. 
Fig. 21. Metaphase of mitosis in spermatid mother-cell, x 1750. Stained with iron haema- 
toxylin and safranin. 
Fig. 22. Formation of spermatids within spermatid mother-cell; line of separation indicated 
between them, x 2400. 
Fig. 23. Separation of spermatids, and appearance of a blepharoplast in cytoplasm of each cell, 
x 2400. 
Fig. 24. Migration of blepharoplasts to opposite poles, x 2400. 
Fig. 25. Migration of blepharoplasts to like poles, x 2400. 
Fig. 26. First appearance of ‘ Nebenkorper’ in cytoplasm, x 2400. 
Figs. 27 and 28. Migration of ‘Nebenkorper’ towards blepharoplast. x 2400. 
Fig. 29. Elongation of ‘Nebenkorper’ near blepharoplast from which cilia have developed. 
X 2400. 
Fig. 30. Elongation of cytoplasm in direction of the ‘Nebenkorper.’ x 1750. 
Fig. 31. Further elongated cytoplasm which has apparently connected up with the ‘Nebenkorper ’ 
which is thus forming the middle piece of the spermatozoid. x 1750. 
Fig. 32. Condensation of the nucleus and elongation of spermatozoid. x 2400. 
Fig. 33. A later stage in the growth of the spermatozoid. x 2400. 
Fig. 34. Mature spermatozoid still within matrix. Stained with gentian violet, x about 1800. 
Figs. 35 and 36. Free spermatozoids. x about 1800. 
PLATE VI. 
Figs. 37-44. Successive stages in development of archegonium. x 560. 
Fig. 45. Mature archegonium in which a well-marked receptive spot is seen in the egg. x 560. 
Figs. 46 and 47. Cross-section showing number of neck-cells. x 560. 
Fig. 48. Spirem stage of nucleus in archesporial cell. Nucleolus still present, x 1750. 
Fig. 49. Spirem stage of nucleus of similar cell in which nucleolus has disappeared, x 1750. 
Fig. 50. A group of archesporial cells in one of which a mature spindle is figured, x 1200. 
Fig. 51. Anaphase, in archesporial mitosis. 
Fig. 52. Formation of daughter-cells, x 1750. 
Fig. 53. A group of sporogenous cells among which have appeared elater initials. The larger 
cells are spore-mother-cells, x 650. 
Fig. 54. Initial stage in the formation of a spore-tetrad, x 560. 
Fig. 55. A later stage in which the nucleus is elongating into each lobe. 
Figs. 56, 57 and 57 a. Spore-tetrads and elater of same age. x 560. 
Fig. 58. Section through spores of a tetrad about to separate. Mucilaginous wall between and 
around them, x 560. 
Fig. 59. A ripe spore, x 560. 
Fig. 60. A mature elater and median section through a ripe spore, x 560. 
Fig. 61. Diagram of a longitudinal section of sporogonium just previous to elongation of the 
seta, x 80. 
Fig. 62. Median longitudinal section through the foot, x 335. 
Fig. 63. View of a portion of inner surface of capsule wall showing annular thickenings. 
X 560. 
Fig. 64. View of capsule wall seen in longitudinal section of capsule. Showing annular bands 
in cells of both layers, x 560. 
Fig. 65. Spindle in cell of gametophyte, x 1200. 
