PLATE 43 

 Zonaria Farlowii S. and G. 

 Pig. 63. Habit sketch indicating parallel and radiating lines of cells. 



Diagrammatic. 



Leathesia arnplissima S. and <j. 



v i„^ +« thP surface of the frond showing the 

 Pig 64. Section perpendicular to the surtace or t 



chara cter 8 of the cells, hairs, paralyses, and zoosporangra. X 250. 



Leathesia difformis (L.) Areseh. 



Fig. 65. Section perpendicular to the surface of the frond ehomng the 

 eharaiter, of the cells, hairs, paraphyses, and gametangra. X 25». 



,,,.. 66 section perpendicular to the surface of the frond show.ng the 

 JL„ Sfccllaf Josporaugia, gamatangia, hairs, and paraphyses X 250. 



Leathesia nana S. and G. 

 Fie 67 Section through the frond perpendicular to the surface showing 

 „, .hotter of a few filaments bearing hairs, gametangia, and paraphyses. 

 X 125. 



[758] 



