18 



The filaments are as a rule very stiff and straight and 

 arise from the principal filaments, often serially, sometimes 



Fig. 7. Acrochsetium Sargassi nov. spec. 

 Habit of a plant with monosporangia and antheridia. (About 180 : 1). 



scattered, and now and then opposite (Fig. 7). The branches 

 are similarly ramified and run out into long hair-like organs. 



