ChcetopUoracece 



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 fllomerata (Vaucb.) 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, Ivypno- 

 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 



