169 



side (fig. 85 B). I cannot give any details about the contents of the carpogonium, 

 as on staining witli hsematoxyUne it was in a great part very dark and intrans- 

 parent. In tlie specimens collected in August and September numerous carpogonia 

 witii short trichogynes were found; oilier carpogonia had long trichogynes making 

 their way outwards tlirough the corlex, and tips of trichogynes protruding through 

 the surface of the frond were also met with, but I have not yet seen spermatia 

 fixed to them, and it remains thus to state whether fertilization takes place normally 

 or the cystocarp may develop parlhenogenelically, as in Platoma Bairdii. The car- 



Fig. 87. 



Furcellaria fastigiala. Sections of frond with young cystocarps. c, carpogonia; a, auxiliary cells; g, gominoblasts. 



September. A 180 : 1. B 190 : 1. 



pogonium shown in fig. 85 D seems to agree with the latter assumption, as an out- 

 growth is given oil" from the base of the carpogonium, while the trichogyne is very 

 short and unfertilized. 



The auxiliary cells (a in the figs.) arise, as stated by Schmitz (Engler u. Prantl, 

 p. 526), from single cells in the inner cortex which seem to be at first but little 

 different from the vegetative cells. They fuse with the long sporogenous filaments 

 produced by the carpogonia and growing wideljr between the inner cortical cells 

 and the medullary filaments. The fusion takes place at the inner end of the cell. 

 After the fusion the auxiliary cell soon begins to produce gonimoblast cells laterally 

 and at the inner side, and thus young cystocarps may occur already in August (fig. 86). 

 The auxiliary cell after fertilization contains a number of nuclei, four or more, some 

 of which certainly derive from the original nucleus of the cell, while the others 

 are sporogenous (fig. 86 A, 87). The cell increases in volume and takes a more ir- 

 regular outline. Fusions between neighbouring cortical cells seem to occur (fig. 87). 



I). K. D. Vidensli. Selsli. Slir., 7. R;elike, natui-vidensk. oj; niiithein. Afcl. VII. 2. 22 



