250 CRYPTOGAMIA ALG.E. 



tables of the great and rich in England and Ireland, but 

 rarely eaten in Scotland, and never used in this town. I 

 should suppose that the palate must be taught to acquire 

 a relish for its peculiar flavour and glutinous quality. 

 The daily use of it may be of service in scrofulous com- 

 plaints, on account of the portion of iodine which it con- 

 tains. 



4. U. latissima, frond green, widely oblong or roundish, waved, 

 membranous, thin. GREV. Alg. Brit. 171. U. lactuca, LIGHTF. 

 Scot. 970. HOOK. Scot. ii. 90. GREV. Fl Edin. 299. 



Hab. On rocks in the sea, common. 



This is the Green Laver or Oyster-green known at table, but 

 inferior to the preceding. GERARDE give us the origin of 

 the latter name. " It is very well knowne euen to the 

 poore oister-women which carry oisters to sell vp and 

 downe, who are greatly desirous of the said mosse for the 

 decking and beautifying of their oisters to make them sell 

 the better. This mosse they doe call oister-greene." 



5. U. lactuca, frond green, at first obovate, saccate, inflated, at 

 length cleft down to the base, the segments plane, unequal, laci- 

 niated, semitransparent. GREV. Alg. Brit. 1??. ; Crypt. Fl.t. 313. 



Hab. In pools near high water mark, attached to sea-weed 

 and stones. Berwick Bay, plentiful. 



In its first stage this ulva resembles a Florence-flask in mi- 

 niature, or rather the gall-bladder of quadrupeds, but it 

 soon bursts, and becomes cleft in a very irregular manner. 

 Notwithstanding the authority of Dr GREVILLE is against 

 it, I am of opinion that this is a variety of the preceding. 



6. U. bullosa, frond green, obovate, saccate, gelatinous, at 

 length irregularly expanded, waved and bullate. GREV. Alg. Brit. 

 174. 



Hab. Fresh water ponds. Magdalen fields. Spring. Q 



Very lubricous, thin, and tender. It floats on the surface, 

 being rendered buoyant by bubbles of air entangled in the 

 fronds, when they appear, to use the apt comparison of 

 DILLENIUS, as if in a state of fermentation. 



7 U. crispa, fronds crowded, deep green, rounded, inflated, 

 much wrinkled and folded GREV. Alg. Brit. 175. LIGHTF. 

 Scot. ii. 972. Tremella terrestris, DILL. Muse. 52. t. 10. f. 12. 



