‘ 
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“ 
1902] CLADOCHYTRIUM ALISMATIS 61 
Fic. 16. Side view of a temporary sporangium showing its rhizoid. 
Fig. 17. A temporary sporangium that had emptied three times. 
Fig. 18. Several young temporary sporangia, illustrating the early 
development of the rhizoid. 
Fig. 19. Zoospores from temporary sporangium. 
PLATE Ul, 
Fig. 20. Epidermal view of portion of Alisma leaf showing numerous 
immature temporary sporangia. 
Figs. 21-24. Successive stages in the germination of C. Menyanthis, the 
sporangia being bound together by remains of plant cells. 
Figs. 25-32. Stages in the development of the resting sporangia of C. 
Alismatis, 
FiG, 25. Penetrating zoospore with Samme/zel/en and mycelial threads. 
Fig. 26. Two penetrating zoospores with Sammelzelien and mycelial 
threads, one of which is forming a young Sammedze//en in an adjacent cell. 
FIG. 27. Sammelzellen with attached young sporangial cell, 
FIG. 28. Sporangial cell further advanced. 
F1G, 29. Sammelzellen ene sporangium about full size, and sec- 
ondary Sammelzelien well advan 
Fic. 30. The beginning of ‘aia Sammelzellen. 
Fi. 31. Secondary Samme/zellen dividing into apical and basal cells. 
FIG. 32. Secondary Sammeizellen collapsing, with attached young spor- 
angium. 
PLATE IV, - 
Figs. 33-46. Resting sporangia of C. A/ismatis. 
Fig. 33. Section through cells of old leaf of Alisma, showing resting 
Sporan, gia 
Fic. 34. Germinating sporangia still imbedded in woody cell of petiole. 
_ Figs. 35, 36. The same resting sporangium just before and after empty- 
its zoospores. 
FiG. 37. Side view of an empty resting sporangium. 
_ *1G. 38. Resting sporangium with protoplasmic contents divided into 
areas, small oil drops, and beginning of papilla of eamceare oe gs 
FIG. 39. Resting sporangium with prominent la f dehis a 
ut to di its zoospores. : 
FIG. 40. Fresh zoospore from resting sporangium. 
Fig, 41, Older and sluggish zoospores 
Fig. 42. Still older zoospores, having toai their cilia. 
Fig. 43. 
bodies, 
Old zoospores going to pieces, showing ——— with ere. 2 
2 it 44~46. Stages of resting sporangia in cells of young aquatic leaves oe 
ue lisma ; produced by artificial infection. 
