188 BRITISH SEA-WEEDS. 



Fuci and other large weeds. It resembles the Opvntia, 

 or prickly-pear, in habit, and the whole plant is made 

 up of a number of similar joints springing one from 

 another, at first singly, then three together, or whorled. 



Chylocladia clavellosa. The clubbed Chylocladia. 



Fronds from a few inches to a foot long, gelatinously 

 membranaceous, much branched ; brandies pinnate, crowded, 

 thickly set with short, spindle-shaped branchlets. Spores 

 angular, in ovate or conical couceptacles ; tetraspores im- 

 mersed in the branchlets. 



This species is moderately abundant on all parts of 

 the British coast, from the extreme north of Scotland to 

 the Channel Islands. It is a well-marked, handsome 

 plant, of tender substance and light red colour, which 

 becomes darker in drying. It is annual, and grows near 

 low-water mark, or at a greater depth, either on rocks' 

 or on the stems of Laminarm and other Algae. 



Chylocladia rosea. The rose-coloured Chylo- 

 cladia. 



Eronds one to two inches high, pinnately branched, 

 hollow, all the divisions when young broadly S|)indle-shaped, 

 lengthening with age; the branchlets ultimately becoming 

 long and very narrow. Tetraspores tripartite, scattered in 

 irregular patches over the frond. 



Mr. Gatcombe writes from Plymouth, " I have inva- 

 riably found this species growing on the sheltered sides 

 of perpendicular rocks, in pools, or when left dry at very 

 low water, and I feel confident that owing to the great 

 resemblance it bears to young Delesseria Hypoglos- 

 sum, it must have been frequently overlooked by algo- 



