PLATE 34 

 Myroinema minutissimum S. and G. 



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

 X 125. 



Fig. 2. A 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. doUiformum S. and G. 



Fig. 4. A fragment showing relatively large erect sterile filaments and 

 relatively small and few gametangia. X 250. 



Fig. 5. A fragment showing the ojiposite condition to that of figure 4. 

 X 250. 



Myrionema attenuatum S. and G. 



Fig. 6. A fragment taken near the margin of the frond. X 250. 

 Fig. 7. A 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. A segment of the base at the margin of the frond. X 250. 



Myrionema compsonemat aides S. and G. 



Fig. 10. A section of a characteristic frond showing the erect sterile fila- 

 ments, gametangia, and "ascocysts. " X 125. 



Myrionema Jiecatonematoides 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. A section through a typical frond and its host perpendicular to the 

 latter. X 250. 



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