448 BOTANICAL GAZETTE [june 



similar 



of the carpogonial branch. The 

 which could be distinguished from 



sim 



a carpogonial branch consists of 3 cells (fig. 47). The 

 of the two branches is very apparent. The terminal cell of the 

 auxiliary cell apparatus as a rule is not as pointed as that of the 

 carpogonial branch (compare figs. 44-53 vsrith figs. 24-28). There 

 are, however, exceptions to this rule (figs. 48, 54). This cell may 

 not be pointed even when it is about to divide (figs. 52, 53). There 

 is also some difference in the way in which the cytoplasm of the 

 cells of the two branches stains. This difference is so slight that 

 it can be used as a criterion in distinguishing the two kinds of 

 branches only when they are in one section or in sections which 

 have been similarly fixed and stained. The basal cell of the 

 auxiliary cell apparatus is often binucleate (fig. 50) and sometimes 

 contains 3 nuclei (fig. 48), as does the similar cell in the carpogonial 

 branch (fig. 36). None of the cells except the terminal one was 

 ever observed to be binucleate in a carpogonial branch which was 

 not mature. The auxiliary cell branch shown in fig. 49 is not 

 mature, and the second cell is binucleate. Fig. 50 shows an 

 immature branch in which 3 cells are binucleate. Some of the 

 cells in the auxiliary cell branches contain chromatophores similar 

 to those in the cells of the mature carpogonial branches and in the 

 sporogenous filaments (figs. 44, 55). The auxiliary cell is either 

 the second or third cell of the branch (figs. 43, 45, 57-60, 63). 

 The sporogenous filament with the nucleus in its end grows toward 

 the auxiliary cell branch (fig. 54). 



The sporogenous filament fuses with the auxiliary cell (figs. 43 > 

 45 , 56, 59). Some of the cytoplasm of the sporogenous filament 

 undoubtedly fuses with that of the auxiliary cell. This appears 

 evident from the fact that the end of the sporogenous filament 

 always contains cytoplasm and in some cases terminates in the 

 auxiliary cell (figs. 45, 56, 59). After the fusion of the sporogenous 

 filament with the auxiliary cell, the original nucleus of the latter 

 maintains its former position (figs. 45, 60, 63) or withdraws to one 

 side (fig. 58) as in Dudresnaya purpurifera and D. coccinea. It has 

 been stated that cells 2 and 3 of the auxiliary cell branch are 

 occasionally binucleate. This binucleate condition in the auxiliary 



