THE MARINE BOTANIST. 269 



lower half; this forms the disting-uishing mark of 

 the species. Colour a rose-red when well coloured^ 

 but often brownish red. Grows on mud-covered 

 rocks near low water-mark. Annual. Summer, 

 Rather rare. Yarmouth. Sidmouth. Torquay. 

 Very fine at Plymouth. Falmouth. Land's End, 

 Swansea. Ilfracombe. Coast of Somerset, Cleve- 

 don, Blue Anchor Bay; and common on wood- work 

 at Minehead, I. G. It is the only species of the 

 genus besides C. Rothii that I find in a growing- 

 state on the shores of the Somerset portion of the 

 Severn Sea. East coast of Ireland. Clontarf, 

 Howth. 



CALLITHAMNION CORYMBOSUM.-CO^ 

 RYMBOSE CALLITHAMNION. 



From one to three inches high; though small, 

 this plant may be distinguished by the naked eye 

 from other species, by the corymbose or level-topped 

 appearance of the branchlets. Colour rose-red. 

 Very slender and capillary ; flaccid, adhering closely 



