PLATE 26. 



Fig. 31. Section of a young conidium of Dermocarpa fucicola shortly after 

 escaping from the parent plant. The chromatin net is beginning to 

 form in the center of the cell. 



Fig. 32. Section of a somewhat more advanced stage of Dermocarpa fuci- 

 cola than is shown in Fig. 31. A definite chromatin network has been 

 formed. 



Fig. 33. Section of a mature plant of Dermocarpa fucicola in vegetative 

 condition, showing a definite network of chromatin occupying the 

 larger part of the eell and surrounded by a thin layer of cytoplasm. 



Fig. 34. Section of Dermocarpa fucicola showing mature conidia. 



Fig. 35. Longitudinal section of Lyngbya aestuarii showing the £ gran- 

 ules along the cross-cell walls. The larger granules are along the 

 older cell-walls, and new ones are shown arising along the new walls. 



Fig. 36. Oscillatoria chalybea. Longitudinal view showing the a granules 

 among the fine chromatin threads. 



Fig. 37. Cylindrospermum licheniforme. The lower cell of the series is 

 dividing, showing the chromatin still connecting the two daughter 

 nuclei. 



Fig. 38. Lyngbya Lagerheimii. Longitudinal view showing a single irreg- 

 ular chromatin mass and a single a granule in each cell. 



Figs. 40-44. Synechocystis aquatilis. Showing various stages of cell divi- 

 sion. Fig. 40, a resting cell; Fig. 41, beginning of cell division; 

 Fig. 42, beginning of separation of the three masses of chromatin; 

 Fig. 43, more advanced stage; and Fig. 44, two daughter cells before 

 separation. ^^= rr --.- i ^ 5 =5^ 



' op the: 

 UNWER 



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