XIVv.] ALGE. 207 
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 Rody- 
menta palmata. In texture 
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 /7id@a 
edults. 
Of the third division, the Ch/orospermea, 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 (Porphyra vulgaris), 
which is by some esteemed 
a great luxury, and perhaps 
by as many regarded with 
disgust. Another species (U. /actuca) 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 Conferve—the Yoke- 
Fic. 155.— Ulva latissima. 
