122 BRITISH SEA-WEEDS. 



tetraapores tripartite, imbedded in the extreme ends of the 

 branchlets. 



This plant is usually parasitic on other algse ; but by 

 no means confined to a single species. It grows within 

 the tide-marks, and is distributed all round our coasts; 

 sparingly in Scotland and the north of England, more 

 frequently towards the south, and in greatest abundance 

 in the Channel Islands. Except in the latter locality it 

 is nowhere so common as L. pinnatifida, nor does it as- 

 sume so many forms as that variable species. It is a 

 summer annual. 



Genus XLV. CHAMPIA. 



Frond rounded or flattened, branched, tubular, constricted 

 at intervals, divided internally by transverse, membranous 

 walls. Spores egg-shaped or obconical, arranged in clusters 

 on branclied threads in conical conceptacles furnished with 

 a terminal pore; tetraspores tripartite, scattered among 

 the surface-cells of the branches and branchlets. 



Until lately this genus contained only one species, 

 which was a native of the Cape of Good Hope. Dr. 

 Harvey, in his ' Nereis Boreali- Americana,' has added to 

 it several species which had been considered to belong to 

 other genera : Chylocladia parvula of British authors is 

 included among them on the ground that it has ovate 

 or conical conceptacles with a terminal pore, and a 

 sporaceous nucleus which while it resembles that of the 

 typical species of Champia differs materially from those 

 of Chylocladia and Lomentaria. 



Champia parvnla. The small Champia. 



Fronds growing in dense, globose tufts, irregularly 



