Chcetophoracece 



87 



Genus Draparnaldia Bory, 1808. The thallus is very gelati- 

 nous, and is differentiated into a principal filament and clusters of 

 lateral branches. The cells of the main filament are large, more 

 or less barrel-shaped, and are furnished with an equatorial, parietal 

 chloroplast with toothed edges. The main lateral branches are 

 alternate, opposite or verticillate, and are themselves very much 



Fig. 29. Draparnaldia glomerata ( Vauch.) Ag., from Tintagel, Cornwall. A, por- 

 tion of thallus ( x 100) ; B, single cell of main filament showing the chloroplast 

 ( x 220) ; C, part of branch showing escape of zoogonidia ( x 500) ; D, hypno- 

 spores formed from cells of branches ( x 500). 



branched, the apical cells frequently terminating in long hyaline 

 hairs. From 1 to 4 zoogonidia arise in each cell of the lateral 

 branches (fig. 29 C) and they are furnished with four cilia. They 

 frequently escape through a hole in the cell-wall much smaller 



