10 



T. Holm — Studies in the Cyperacece. 



structure as described above for S. pauciflora, as regards their 

 development and distribution. 



Fig. 3. Leaf of S. verticillata ; transverse section; B 0, bulliform cells, x 120. 



Scleria verticillata and S. hirtella differ, however, from the 

 other species of Scleria, which we have examined, and as a 

 matter of fact from all the other Cyperacese which we have 

 studied anatomically, by possessing some very peculiar incrus- 

 tations of silica upon the radial walls of the bulliform cells. 

 The accompanying figure 4 illustrates two bulliform cells in 



Fig. 4. Two bulliform cells from the leaf of S. verticillata with incrustations ; 

 transverse section, x 320. 



Fig. 5. A macerated bulliform pell of S. verticillata with incrustations, x 320. 

 Fig. 6. Incrustations from bulliform cells of S. verticillata. x 320. 



transverse section, with incrustations upon the radial- walls, the 

 outline of which are indicated by dotted lines in our figure. 

 These incrustations form granular masses of a whitish color 

 and are present in almost all the bulJiform cells, but varying 

 somewhat in shape and size. By burning sections of the leaf 

 to white ashes and then adding a few drops of hydrochloric 

 acid these incrustations become very conspicuous and assume 

 a clear brown color like sepia. Figure 5 illustrates a macerated 

 bulliform cell, and we notice here that the incrustation has 

 taken place to the same extent on both of the adjoining radial 

 cell-walls. A part of the radial cell- wall upon which the 

 incrustation takes place contains also silica and remains as frag- 

 ments attached to the incrustations after they have been mace- 

 rated, which is to be seen in the accompanying figure 6. Figs. 



