320 THE MARINE BOTANIST, 



ULVA LACTUCA.— LETTUCE ULVA.— 

 " OYSTER GREEN." 



Fronds three to six inches in length ^ when 

 young", like a round bag, then bursting and tearing 

 into many irregularly-shaped segments. A smaller 

 and far more tender plant than the preceding ; of a 

 pale yellow-green colour, and adheres closely to 

 paper. Grows on rocks, stones, coralHnes, &c. 

 Annual. May and June. Generally distributed 

 round the British coasts, but less common than L. 

 latissima. 



ULVA LINZA.— ENTEROMORPHA-LIKE 

 ULVA. 



Fronds clustered, six inches to two feet in length, 

 half an inch to an inch and a half wide, linear 

 lanceolate, tapering to each extremity, much 

 curled, of a fine grass-green colour. The frond in 

 this species is composed of two membranes closely 

 applied, a structure showing an affinity with Entero- 



