322 



BOTANICAL GAZETTE 



[APRIL 



f 



xplaining the situation, the development 



antheridium would be 



Investigation 



Thallus 



The vegetative body of Fossombronia cristula is minute, being 

 only 2-4 mm. in length. It is creeping and semi-prostrate, although 



.1 



2 



1 



-2 



Fig. 1. — Above, F. longiseta; below, F. cristula 



1 



the stem tips may occasionally be more or lesj 

 branching is rather profuse and is strictly apical. 

 no indication of a conducting system as in Pallc 



The 



stem 



and Sym- 



phyogy 



The plants form dense matlike grow 



(fig 



means of long, violet-red rhizoids 

 an annual, developing in the early summer 



habitat becomes sufficiently d 

 res are ripe by late September 



in the Dune 



