一 24 一 



filled up with rhizoid cells. 上、 he latter are elonp-ated or roundish and 

 branch in various directions, forming a reticulation around the paren- 

 chymatic cells. Often they send off branches into the free space of 

 the caivty of ball. They are connected with the axial, the pericentral, 

 and the remaining- cells by so-called pit-formation. Thus, the 

 rhizomes and the pedicels of the balls are densely constructed, not 

 presenting any loosening of the tissue. 



When the hall is very small, its inner tissue is solid, only present- 

 ing- minute intercellular spaces. As it grows larger and larger, it 

 becomes excavated within, and throuc^i the centre of the cavity the 

 median axis passes lom'.itudinally. Here, the axis is very conspicuous, 

 it being composed of elono-ated cylindrical cells. Beneath the articula- 

 tions the axial cells are slightly swollen, and from that part 5 

 pericentral cells are usually emitted in a verticillate manner. The 

 pericentral cells in this part are very much elonp-ated into slender 

 filiform cells which are stretched out in a horizontal direction. They 

 are emitted in the upper articulations of the axis almost in the same 

 level, but in the lower ones their arrangement becomes more 

 irregular, and i)ot seldom 6 of them are here and there present. 



Besides the pericentral cells there arises a slender filament from 

 the shoulder of each axial cell, which forms the basal cell of a " hair- 

 leaf of German writers. The basal cell of hair-leaf is always 

 situated just above one of the pericentral cells. It is always single 

 on every axial cell and is spirally inserted alono^ the axis. Around 

 the apical cell there are 2 or 3 circles of hair-leaves, when viewed 

 from above. They are soon dropped oft: beino- detached from the 

 swollen extremities of their basal cells which are a little prominent 

 above the cortical layer. Hair-leaves arc not seen in the greater 

 part ol the ball-like portion ； but we may rigiidy conclude that they 

 have already dropped oft, as there are basal cells arisino- from the 

 axis near the bottom of the cavity. Hair-leaves are many times 



