PLATE 41 



Hecatonema variaMle S. and G. 



Fig. 1. Five fragments of plants taken near the margin of the frond. X 125. 

 Fig. 2. Three fragments, older than figure 1, showing secondary growth 

 within the empty gametangia. X 125. 



Fig. 3. A group of sessile gametangia. X 125. 



Fig. 4. Terminal part of a creeping filament seemingly showing the early 

 stages in the development of the zoosporangia. X 125. 



Fig. 5. A part of a creeping filament showing the heterogeneous develop- 

 ment of erect filaments. X 125. 



Figs. 6, 7, 8, 9. Typical fragments of mature fronds. X 125. 

 Figs. 10, 11. Fragments with zoosporangia, X 125. 

 Fig. 12. A segment of the base. X 125. 



[384] 



