452 EXPLANATION OF THE FIGURES. 



FIG. 



29. Portion of the stem of a young plant, lateral view of the outer surface. 



The inner edges of contact of the cells are shown by dotted lines. 

 X 150. 



30. Longitudinal section of the upper end of a young archegonium, x 200. 



Pigs. 31, 32. Jungermannia intermedia. 



31. Longitudinal section of a half-ripe antheridium, X 300. 



32. Similar section of a young fruit-rudiment of the same plant, X 300. 



Pigs. 33, 34. Jungermannia tricliophylla, 



33. Longitudinal section of a young fruit, x 200. 



34. A set of special-mother-cells out of the same fruit, x 600. 



PLATE X. 



CALYPOGEIA TEIC HOMAGES. 



1 and 6. Longitudinal sections of young fruit-branches, X 200. 



2, 4, 5. Detached fruit-rudiments seen from the outside, figs. 2 and 4, X 300, 



fig. 5, X 150. 



3, 7. Longitudinal sections of similar fruit-rudiments, X 300. 



8. Longitudinal section of the lower part of a young fruit-sac, X 200. 



PLATE XI. 



Pigs. 1 — 7 and 15 — 26. Radula complanata. 



1. Lateral view of an inflorescence ; the antheridia and archegonia are repre- 



sented in section ; the cell contents are not shown. 



2. A very young, 3 a half-ripe antheridium, both in longitudinal section, 



X 500. 



4. Longitudinal section of a more developed fruit-rudiment, together with 



the lower part of the surrounding calyptra, x 200. 



5. Longitudinal section of a young fruit-rudiment, X 500. 



6. Longitudinal section of a somewhat dwarfish fruit-rudiment at the com- 



mencement of the differentiation of the capsule-wall and contents, 

 X 300. 



7. Lower end of the stalk of a half-ripe fruit, x 200. 



15. Two lobes of a somewhat developed leaf spread out, X 200. 



16. Ripe spore, x 200. 



17 — 24. Different states of the development of the fiat pro-embryo, 20, 21, 



and 22 are lateral views, x 200. 

 25". The terminal bud of the first leafy axis, x 300. 

 25 6 , 26. The first leafy axis proceeding from the pro-embryo, X 300. 



