Fio\ 20. Louffitudinal section of a froud contaiuinir a 

 uematliecium. x 4"i. 



Fig. 21. Section showing- tlie undivided spore mother- 

 cells lying in rows, which are continued into 

 the assimilating filaments. Fresh material. 

 xlOTo. 



Fig. 22. Mass of divided tetrasporangia, surrounded l)y 

 the sterile cells in a nemathecium. Fresh 

 material. x 1075. 



Fig. 23. Form of cruciate division of a sporangium. 

 Diagrammatic. 



Fig. 2-1. Another form of the same. Diagrammatic. 



Fig. 25. Another form of the same. Diagrammatic. 



Fig. 20. Single free tetraspore. It is filled with food 

 material ; the darker portions represent parts 

 of the much divided rhodopUistid. x about 

 3000. 



Plate VI.: The NEMAXHECirM and the 

 Speemophoee. 



Fig. 27. Free tetraspore, some time after its escape, and 



surrounded by a wall. In glycerine jelly xl075. 

 Fig. 28. A tetraspore, having germinated to four cells. 



In glycerine jelly. x 1075. 

 Fig. 29. Germinal product of a tetraspore forming a 



rhizoid-iike outgrowth. In glycerine jelly. 



xl075. 

 Fig. '60. Frond bearing spermophore at its tips. x 2. 

 Fig. '61. Two spermophores. x 12. 

 Fig. '6'2. Outer layers of the tissue of a spermophore. 



The assimilating cell rows end in antheridia. 



The last cell of each antheridium, the sperma-. 



tangium, gives rise to one spermatium. In 



glycerine jelly. x 1075. 



