Richards: Ceramothamnion codii 265 



penetrate. Collected in February on the south shore of the main 

 island of Bermuda. 



Explanation of folates 21, 22 



Plate 21 



Fig. I. Habit, showing the prostrate and erect filaments, rhizoids and masses of 

 polyspores. 



Fig. 2. Growing tip, showing also the appearance of the chromatophores in the 

 internodal cells. 



Fig. 3. Same in different stage of division. 



Fig. 4. Tip provided with short hairs. 



Fig. 5. Tip where the hairs are greatly elongated. 



Figs. 6 and 7. Formation of new apical cells in a broken filament. 



Fig. 8. Tetrasporangia in various stages of development. 



Fig. 9. Tetrasporangia on same filament with hairs. 



Figs. 10 and 11. Tetrasporangia developing within the empty walls of previous 



ones. 



Fig. 12. Tetraspores almost ripe with young tetrasporangium developing. 

 Fig. 13. Fully developed tetrasporangium showing bract-like covering. 

 Fig. 14. Empty sporangium after discharge of spores. 



Plate 22 



Fig. 15. Showing the origin of whorl of secondary branches. 

 Figs. 16, 17, 18. Various stages in development of polyspores. 

 Fig. 19. Abnormal development of polyspores at an early stage. 

 Fig. 20. Mature polyspores. 

 Fig. 21. Mature antheridium. 



Fig. 22. Optical section of antheridium. 



Fig. 23. Young antheridia developing. The nodal cells above have produced 



hairs. 



All the figures were drawn with an Abbe camera. I, X 3° diam.; 2-14, X4^o 

 diam.; 15-23, X 4 8 ° diam., and reduced about one third. The drawings were made 

 from specimens preserved in alcohol and treated with lactic acid causing the outer 

 wall to swell away from the contents to some extent. 



