PLATE 33 

 Myrionema foecundum f. subulatum S. and G. 



FifT. 1. A section through a plant and its host perpendicular to the surface, 

 tnlvoii near tlio iiiarLriii. X 125. 



Fig. 2. Same as figure 1. X '2.~)0. 



Fig. 3. A segment of the base at the margin on the surface of the host. 

 X 125. 



Myrionema corunnae f. uniforme S. and G. 



Fig. 4. Three fragments of plants showing the base and typical gametangia. 

 X 250. 



Fig. 5. Segments of the base, diagrammatic. 



Myrionema corunnae f. angulatum S. and G. 



Fig. 6. A part of a frond taken near the center of the frond. X 250. 

 Fig. 7. A part of the frond taken near the circumference of the frond. 

 X 250. 



Myrionema foecundum f. ramulosum S. and G. 



Fig. 8. Two fragments of fronds showing the base and tj'pical gametangia. 

 X 125. 



Myrionema foecundum f. simplicissimum S. and G. 



Fig. 9. A section through a frond near its margin, and its host perpendicular 

 to the surface showing the base, the sessile gametangia and the so-called asco- 

 cysts. X 125. 



Fig. 10. A section showing the "ascoeysts" grouped. X 250. 



Myrionema haltieum f. pedicellatum S. and G. 



Fig. 11. A group of typical gametangia and erect filaments from the basal 

 layer. X 125. 



Fig. 12. Same as figure 10 with zoosporangia( ?). X 125. 



Myrionema corunnae f. sterile S. and G. 



Fig. 13. A diagrammatic section to show tlie gradual diminution in the 

 length of the erect filaments from the center to the circumference of the frond. 



Fig. 14. A section at the margin of the frond. X 250. 



Fig. 15. A section through the center of the frond showing mature game- 

 tangia and interspersed sterile filaments. X 250. 



Myrionema globosum f. afme S. and G. 

 Fig. 16. A fragment of a typical plant. X 125. 



[350] 



