Leaf and Sporocarp in Marsilia quadrifolia , L. 145 
Fig. 31®. A slightly older sporocarp than Fig. 25, on a petiole, showing capsule 
bent against the stalk. 
Fig. 32. The same as Fig. 31 at the time of closing of soral canal, x 500. 
Fig. 33. The same still later, x 45. 
Fig. 34. Ventral surface of capsule a little older than Fig. 25. x 750. 
Fig* 35 * Part °f horizontal section of about the age of Fig. 30 near the ventral 
surface, x 750. 
Fig. 36. Horizontal section of capsule about the age of Fig. 31 near the ventral 
surface, x 750. 
Fig* 3 7. The same of about the age of Fig. 32. x 750. 
Fig. 38. Sagittal section through the marginal cells of capsule about the same 
age as Fig. 29. x 750. 
Fig. 39. Sagittal section through sections III and IV of capsule, the same age 
as the last, x 750. 
PLATE XII. 
Fig. 40. Sagittal section through sections III and IV of a capsule of about the 
age of Fig. 31. x 750. 
Fig. 41. Part of horizontal section of capsule of the age of Fig. 33, x 750. 
Fig. 42. The same of whole capsule of same age as Fig. 41. x 50. 
Fig. 43. Sagittal section through sori of same capsule as Fig. 40. x 750. 
Fig. 44. View of inner side of one of the valves of a nearly mature capsule, x 8. 
