XIV.] 



ALG^E. 



207 



FIG. 154. Chondrus crispus. 



often prescribed for consumptives, for which purpose 



it is said to be far more valuable than ordinary 



animal gelatine. Another 



of the Rhodosperms used 



for food is the Dulse or 



Dillusk of the Scotch. 



Botanically it is the RJwdy- 



menia palmata. I n textu re 



it is very tough, but yet 



not to be despised by the 



hungry, by whom it is 



eaten raw. Frequently 



sold with it under the 



same name are the tough, dark-red fronds of Iridcea 



editlis. 



Of the third division, the Chlorospermece, we have 

 a familiar marine example 

 in the Ulva latissima or Sea- 

 lettuce, which consists of a 

 very thin flat green frond (fig. 

 155). It is sometimes known 

 as the Green Laver, on account 

 of its being eaten like the true 

 Laver (PorpJiyra vulgar is), 

 which is by some esteemed 

 a great luxury, and perhaps 

 by as many regarded with 

 disgust. Another species (U. lactucd] is frequently 

 attached to oysters, and hence termed Oyster Green. 

 In Scotland it is sometimes used as a remedy for 

 headache by being bound round the temples. 



In this group also occur the Conferva the Yoke- 



