PLATE 55 



Myrioncma minutissimum S. and G. 



Fig. 1. Two groups of gametangia, the left, youuger, and the right, older. 

 X 125. 



Fig. 2. Segment of the base showing the typical splitting of the terminal 

 cells. X 250. 



Fig. 3. Small groups of gametangia showing different lengths of pedicels. 



X 250. 



Myrionema attenuatum f. doUiforme S. and G. 



Fig. 4. Fragment showing relatively large erect sterile filaments and rela- 

 tively small and few gametangia. X 250. 



Fig. 5. Fragment showing the opposite condition to that of figure 4. X 250. 



Myrionema attenuatum S. and G. 



Fig. 6. Fragment taken near the margin of the frond. X 2'50'. 

 Fig. 7. Fragment taken near the center of the frond. X 250. 



Myrionema foecundum f. divergens S. and G. 

 Fig. 8. Sections taken from four different places in the frond., X 125. 

 Fig. 9. Segment of the base at the margin of the frond. X 250. 



Myrionema compsonematoides S. and G. 



Fig. 10. Section of a characteristic frond showing the erect sterile filaments, 

 gametangia, and "ascocysts. " X 125. 



Myrionema hecatonematoides S. and G. 



Fig. 11. Five fragments showing the nature of the base, the shapes, sizes, 

 and positions of the gametangia, and the erect filaments. X 125. 



Myrionema primarium S. and G. 



Fig. 12. Section through a typical frond and its host perpendicular to the 

 latter. X 250: 



This plate is a reprint of Setchell and Gardner, Univ. Calif. Publ. Bot., vol. 7, 

 p. 352, pi. 34, 1922. 



[782] 



