THE MARINE BOTANIST. 241 



rocks between tide-marks, common; rarely on the 

 stems of Fucus serratus. Frequently on the south- 

 west of England where P. plumosa is not known. 

 Perennial. Summer and Autumn. 



MICROCLADIA. 



Name meaning a small branch. 



Frond filiform, compressed, distichously branched. 

 Fructification: 1. roundish Javellce with an invo- 

 lucre y 2. tetraspores immersed in the ramuli. 



MICROCLADIA GLANDULOSA.— PINK 

 MICROCLADIA. 



Fronds narrow, compressed, one or two inches 

 high, much branched, and irregularly forked 

 throughout. Colour a fine rose-red. Substance 

 between membranaceous and cartilaginous. This 

 species looks not unlike poor specimens of Ploca- 

 mium coccineum without the comb-like ramuli, but 



R 



