234 THE MARINE BOTANIST. 



former case the globular whorls (or heads) conceal 

 the main thread altogether ] in the latter they are 

 widely separated, and then the plant, under a low- 

 power of the microscope, something* resembles Ce- 

 ramium diaphanumr Fructification, tetraspores of 

 large size, resembling those of Callithamnion : the 

 favellidia were not known on English plants until 

 Miss Warren discovered them in 1850. Parasitical 

 on Cladostephus spongioses. Very rare. Salcombe, 

 Devon. Mrs. Wyatt. Plymouth, on Corallina 

 officinalis^ Mr. Boswarva. Falmouth with favel- 

 lidia, Miss Warren, 1850. Mousehole, near Pen- 

 zance, Mr. Ralfs. 



CERAMIACE.E.— CERAMIUM TRIBE. 



"Rose-red or purple sea-weeds, with a filiform 

 frond, consisting of an articulated, branching fila- 

 ment, composed of a single string of cells, some- 

 times coated with a stratum of small cells. Fruc- 

 tijication : 1. favell(B, berry-like receptacles, con- 

 taining numerous angular spores ; 2. tetraspores 



