PLATE 53 



Hecatonema clavatum S. and G. 



Fig. 1. Section through a typical mature plant showing penetrating rhizoids 

 from the basal layer, the leavate, sterile, ereet filaments, and typical game- 

 tangia. X 250'. 



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



Fig. 3. Small fragment without rhizoids. X 125. 



Fig. 4. Segment of the base at its margin. X 250. 



Hecatonema Lawsonii S. and G. 



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

 cells. X 250. 



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

 X 250. 



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



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

 p. 382, pi. 40, 1922. 



[778] 



