PLATE 40 



Hecatonema clavatum S. and G. 



Fig. 1. A section through a typical mature plant showing penetrating 

 rhizoids from the basal layer, the clavate, sterile, erect filaments, and typical 

 gametangia. X 250. 



Fig. 2. The same as figure 1, but showing " ascocysts. " X 250. 

 Fig. 3. A small fragment without rhizoids. X 125. 

 Fig. 4. A segment of the base at its margin. X 250. 



Hecatonema Latvsonii S. and G. 



Fig. 5. Two segments of the base showing frequent radial divisions of the 

 cells. X 250. 



Fig. 6. A young plant before any erect filaments have begun to develop. 

 X 250. 



Fig. 7. Typical gametangia and true hairs. X 250. 



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