186 SYNOPSIS <»F BBITI8B BEAWEBD0. 



312. Linza (T//r narrow Ulva) ; frond linear-lanoeo 



crisped at the margin, composed of two membranes <■!■ 

 applied, Linn. Spec. Plant, p. 1633. (Atlas, PL LXXHI. 

 Kg. 34 k) 

 Bolenia Linza, .1//. Phycoserifl Linza, Ktz. Tremella marina fas- 



ciata, DM. ' 

 Hab. On rocks and stones in the sea, at half-tide level. Annual. 

 Summer. 

 Tins is one of the most beautiful of the British I 

 as it is also one of the less common species. Its gracefully 

 shaped and elegantly curled fronds look peculiarly w 

 the plant waves freely in the water. It has long been 

 known to botanists, having been distinguished by Linnaus, 

 and has been found on very distant shores. The frond 

 consists of a double membrane, so that it has been by some 

 authors associated with the Unteromorphce, to which group 

 it affords a direct passage. 



XCYII. PORPHYBJL 



343. laciniata {The laciniated Porphyra) ; frond deeply and 



irregularly cleft into several broad segments, Ag. Syst. 



p. l'JO. (Atlas, PL LXXHI. Fig. 345.) 

 Porphvra umbilicalis, Ktz. Ulva laciniata, Lightf. 17. umbilicalis, 



E. But. 

 Hab. On marine rocks, within the range of the tide. Annual. 



Spring to autumn. 

 This very common plant is found in most parts of the 

 ocean throughout the tropics, and exists nearly as far as 

 vegetation extends towards the poles. It varies in differ- 

 ent places, something in substance, being thicker or 

 thinner ; something in colour, being sometimes of a bright 

 purple, and sometimes much tinged with olivaceous-green ; 

 and something in form, some individuals having a flat 

 lobed frond, and others a cup-shaped frond fixed by a 

 central point. But all its forms are easily recognized, and 

 may be traced by insensible gradations, one into the other. 

 This species, together with the closely allied P. vulgaris, 

 is sometimes brought to table in England under the name 

 of Laver ; and in Scotland and Ireland under that of 

 Sloke, Slouk, or Sloukawn. After many hours' boiling 

 the frond is reduced to a somewhat slimy pulp of a dark- 

 brown colour, which is eaten with pepper and lemon-juice 

 or vinegar, and has an agreeable flavour. 



