G4 COMMON SEAWEEDS. 



tiphloe, in having a jointed axis, composed of four or 

 five large cells, round a central cavity, and the length 

 of these cells makes the stripes, which are most visible 

 in the youngest branches. 



Tetraspores are seen in the club-shaped on mid i. 

 Cera mid la, ovate capsules, transparent, pink, and con- 

 taining each a cluster of pear-shaped spores. 



This is common on the shores of Great Britain and 

 the Channel Islands. 



Latjuencta Tenuis sima (Slender Laurentia). — 

 This is a very pretty seaweed carefully handled, as it 

 is tender and somewhat gelatinous. Pale purple or 

 pinkish red, becoming yellowish, and in fronds from 

 six to eight inches long, it is found parasitic on coarser 

 weed in mid- tide pools, but it is by no means common. 

 Seek for it in sunny, shallow pools. It is a straggler 

 from its native shores of the Mediterranean Sea, where 

 it grows in perfection. Here it needs all the warmth 

 our colder climate can give it, and is therefore more 

 "at home" in Guernsey and Jersey, where the hot 

 Gulf Stream from Mexico passes through our channel 

 and influences our tide-pools as well as our land vege- 

 tation. 



The fruit, often dotted thickly on its branches, small 

 urns containing pear-like spores, or tetraspores em- 

 bedded in the leaf-like ramuli. Weymouth, Isle of 

 Wight, Channel Islands, Torbay, Irish coast, are its 

 localities. 



Latjeencia Obtusa (Blunted Laurencia). — This 

 is another native of the Mediterranean Sea, but very 



