Fig, 344. ULVA LINZA. 
Colour. A fine grass-green, fading in the herbarium. 
Sulstance, Membranaceous ; soft and thin. 
Character of Frond. A long, narrow, ribless, leaf-like expansion, with curled and wavy 
margins ; either blunt or pointed at top, always tapering to the base. 
Measurement. From 6 inches to 2 feet long ; from J inch to 2 inches wide. 
Fructification. As before. 
Habitat. Our coasts generally. On rocks, &c. at half-tide level. Not uncommon. 
The structure of the TJlva has another peculiarity. It is formed of two membranes (each 
one cell thick) so closely laid together, that their existence as two can only he ascertained by 
microscopic investigation. 
Fig. 345. PORPHYRA LACINIATA. 
Colour, Dull purple when growing ; occasionally greenish ; becoming bright and very glossy 
when steeped in fresh water and afterwards laid out and dried. 
Substance. Delicately membranaceous ; sometimes extremely thin ; sometimes thicker and 
firmer. 
Character of Frond. A flat, broad, ribless expansion ; sometimes irregularly divided, or torn ; 
sometimes growing in an irregular circle from a centre root. One or more from one 
base. 
Measurement. From 4 to 8 inches or more across. 
Fructification. Minute seeds {zoospores) formed of the colouring matter in the cells (four 
together) of which the frond-membrane is composed ; and in due time dropping out. 
Habitat. Our coasts generally. On rocks, &c. within the range of the tide. Common. 
This is the laver sold in jars in the shops, and is a great delicacy when stewed and eaten 
hot with lemon-juice. But it should be served up like Hans Andersen’s white snails, in a 
silver dish with a spirit-lamp underneath. It is called sloke, or slokaun, in Scotland and 
Ireland, where it is often gathered for food under that or some other odd name. At Miltown 
Malbay and Kilkee, it is called “ libberum.” 
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