1904] JOHNSON—MONOCLEA 205, 
Fic. 38. Longitudinal section of young embryo and archegonium. X 38. 
Fic. 39. Similar section with a slightly younger embryo, showing the differen- 
tiation of the latter into foot, seta, and capsule. X 160. 
Fic, 40. Longitudinal section of an older embryo, showing differentiation of 
capsule into wall and sporogenous cells. 160 
Fic. 41. Transverse section of an archegonium and embryo of the age of 
that shown in fig. 37, showing arrangement of cells in the capsular region. X 160. 
Fic. 42, Similar section of another embryo. X 160. 
Fic. 43. Transverse section of an archegonium, with an embryo showing 
wall of capsule and isodiametric sporogenous cells. X 38. 
Fic. 44. Detail of last. x 350. 
Fic. 45. Part of longitudinal section of a capsule of the same age as the last. 
X 350. 
Fic. 46. Part of a similar section of an older capsule, showing elaters and 
their spindle-shaped sister cells dividing to spore mother-cells. X 350. 
Fic. 47. Similar figure from an older capsule, showing elaters and rows of 
spore mother-cells. x 350. 
Fic. 48. Longitudinal section of the tip of a nearly mature capsule, showing 
two-layered region of the wall and three-lobed spore mother-cells. X 160. 
Fic. 49. Elaters, tetrads of spores and a cell, from the wall of a still more 
mature capsule. X 350. 
Fic. 50. Single elater from a ripe capsule. 700. 
Fic. 51. A single spore showing structure of spore wall. x 1250. 
Fic. 52. Optical section of spore wall. 1250. 
