PLATE 24. 



Fig. 18. Cylindrospermum licheniforme. Longitudinal section of a young 

 plant. Living material. Ehr. Haem. counterstained with wasserblau, 

 showing the chromatin and a granules stained red and the /3 gran- 

 ules blue, a represents a cell almost divided; in b, c, and d the chro- 

 matin is still connected. 



Fig. 19. Cylindrospermum licheniforme. Longitudinal section. Spore. K. 

 I. Ehr. Haem. 



Fig. 20. Cylindrospermum licheniforme. Longitudinal section of spore, 

 showing the first division in germination. K. I. Ehr. Haem. 



Fig. 21. Cylindrospermum licheniforme. Longitudinal section of almost 

 mature spore and two vegetative cells. K. I. Ehr. Haem. counter- 

 stained with wasserblau, washed in acidulated alcohol. The Ehr. 

 Haem. stains the a granules and the chromatin in the vegetative cells, 

 but there are no a granules in the spore. The wasserblau stains the 

 /3 granules. 



Fig. 22. Symploca Muscorum. Longitudinal section. Ehr. Haem. 3 min- 

 utes, showing only chromatin in the nucleus. 



Fig. 23. Oscillatoria Oleni. Longitudinal section. K. I. Ehr. Haem. 

 counterstained with wasserblau. The /3 granules are close to the 

 cross-walls and in the outer part of the cytoplasm. 



1292] 



