THE MARINE BOTANIST. 267 



plants are often again pectinated in a similar 

 manner. 



Branches either alternate or irregular, upper ones 

 usually longest 5 the appearance of the plant when 

 in water is beautifully delicate and feathery. 

 Colour a rich red. Substance soft and flaccid. 

 Found all along our coasts from Orkney to the 

 Land's End. j3 is a variety smaller in every part. 



CALLITHAMNION TETRAGONUM.— 

 SQUARE-BRANCHED CALLITHAMNION. 



Fronds three to six inches high, stem obscurely 

 jointed and nearly opaque; ^^ repeatedly branched 

 alternately, the branches irregularly quadrifarious, 

 the lowest longest, and set with one or more series 

 of lesser branches, the upper gradually shorter and 

 more simple ; the general outUne of the frond being 

 ovate, with its principal divisions tapering to the 

 apex.'* Substance much firmer than in the pre- 

 ceding species. Colour, pink or reddish brown. 

 FavellcB either placed singly or in pairs, large. 



