ECTOCAUPACE/E. 75 



linear -egg -shaped, attached to the bases of the erect 

 threads. 



But few specimens of this plant have been recorded, 

 probably on account of its extreme minuteness. It 

 grows on Ceramium rubrum and other Red Sea-weeds. 



Myrionema clavatum. Club-shaped Myrionema. 



The only recorded specimens of this species were dis- 

 covered by Captain Carmichael, of Appin, who thus 

 describes it : — " Very minute, rather convex ; filaments 

 clavate, mostly bifid ; spores obovate, pedicellate, affixed 

 to the filaments." 



Order VI. ECTOCARPACEtE. 



Frondsjointed, thread-like. Spores attached to thehranchlets 

 or embedded in their substance. 



Genus XXXII. CLADOSTEPHUS. 



Erond cylindrical, branched, stem without joints, branches 

 covered with whorls of short, jointed branchlets. Fructifica- 

 tion, stalked spores on accessory branchlets, and in a mass 

 called a propaqulum at the tips of certain of the ordinary 

 branchlets. — Cladostephus, from the Grreek dados, a shoot, 

 and stephos, a crown. 



Cladostephus verticillatus. Whorled Clado- 

 stephus. 



Prond from four inches to nearly a foot high, irregularly 

 branched ; branches slender, covered throughout with whorls 

 of jointed, mostly forked branchlets. Pructification formed 

 in winter, when most of the whorled branchlets fall off, and 

 are succeeded by accessory branchlets which bear the 

 spores. 



