86 BRITISH SEA-WEEDS. 



crease in length towards the tip of the frond, giving it 

 the shape of a fox's brush. Spores without stalks, at- 

 tached to the main thread. 



Myriotrichia filiformis. Thread-like My r io- 

 trichia. 



Fronds growing on Cliorda lomentaria, often in company 

 with the last species, an inch or more in length, beset at 

 irregular intervals with oblong clusters of short branchlets, 

 which give them the appearance of being knotted, both the 

 main threads and the branchlets clothed with long, jointed 

 fibres. Spores' without stalks, scattered along the main 

 thread. 



The branchlets of this species are short, and all of the 

 the same length, and are set on in clusters at intervals ; 

 those of M. clavaformis are longer, increasing in length 

 towards the tip of the frond, which is evenly covered 

 with them throughout. With these exceptions, there 

 is but little difference between the two species, and they 

 frequently grow together on the same plant. 



