PLATE 44 



Hea Fascia f. 



Fig. 68. Cross-section of a frond at the edge showing gametangia in 

 continuous sori. X 190. 



Ilea Fascia f. 



Fig. 69. Cross-section of a portion of a frond through several sori on both 

 sides. X 100. 



Ilea Fascia f. 



Fig. 70. Cross-section through a portion of a frond showing gametangia 

 and paraphyses (?). X 500. 



Ilea Fascia f. 



Fig. 71. Cross-section of a portion of a frond showing mature gametangia 

 and paraphyses (?). X 125. 



Scytosiphon Lomentaria (Lyngb.) J. Ag. 



Fig. 72. Cross-section through different parts of the frond: near the base; 

 farther up; mature gametangia. X 125. 



Ilea Fascia f. 

 Fig. 73. Cross-section through gametangia in sori on both sides. X 125. 



Scytosiphon Lomentaria f. complanatus minor S. and G. 



Fig. 74. Cross-section through the margin showing short filaments extend- 

 ing into the cavity and a sorus of gametangia extending around the margin. 

 X 125. 



Scytosiphon Lomentaria f. typicus S. and G. 



Fig. 75. Cross-section showing the character of the cells, gametangia, hairs, 

 and paraphyses (?). X 250. 



[760] 



