— ^6 ^ 



The formation of secondary pits is very general and any two 

 cells coming in contact to each other are connected by this way. In 

 the growing portion of frond, pericentral cells lie near to each other, 

 owing to the shortness of cells of the central axis ； and two 

 pericentral cells or one pericentral cell and one basal cell of a hair- 

 leaf are united as they come in contact (nrs. 26 and 29). By the 

 elon!7ation of central axis, this secondary connection of pericentral 

 cells or of others are detached, then markinp- that part by a slip'htly 

 swollen wall. From those del:ached parts, sometimes slender 

 stnictureless filaments of cellulose substance take their origin. 



The splitting ol layers of cell-walls is of common occurrence. 

 In general, the free side of cells adjacent to the cavity, which are pre- 

 viously much thickened in lamellose structure, is partly peeled oft in 

 the form of thin layers. By this way, a pretty larp*e amount of 

 structureless mass, appearing like o-elatinous fibres is not seldom 

 accumulated at the bottom of the cavity of the ball. 



Tetrasporanp-ia are formed in wart-like or nipple-shaped 

 elongato-ovate stichidia which are situated either solitary or 3-4 

 agcrrep-ated on the upper portion of frond. Very often tetrasporangia 

 are also formed in the ordinary apical portion of frond. The central 

 axis of stichidia is formed as a lateral branch of the basal cell of a 

 hair-leaf in ball-like portion and therefore stichida may be looked 

 upon as secondarily formed branches. Stichidia are slightly narrowed 

 at base as if shortly pedicelcd, and carry hair-leaves on the apical 

 portion. Tetraspors are formed in the mother cells adjacent to 

 pericentral cells which are slender and horizontally stretched out from 

 the axis. In every seo-ment, they are produced in number and. 

 externally protected by two large cover-cells. 



Of antheridia and cystocarps I have searched in vain. 



Amono- the materials, I found a few plantlets germinating on the 

 body of mother plant and on shells. They are already grown in. 



