320 BRITISH SEA- WEEDS. SjClilorospermece . 



The air was motionless, till gentle breeze 

 Sprang np at snnset ; yet huge lumbering Avavcs 

 Rolled in from distant storm, — wild — musical! 

 \Vave-music." — Symington's Harebell Chimes. 



Genus XCIII. PORPHYRA, Agardh. 



« 



Gen. Char. Frond plane, exceedingly thin, and of a purple 

 colour. Pructification : 1, scattered sori of oval seeds ; 2, 

 roundish granules, mostly arranged in a quaternate manner, and 

 covering the frond. — Greville. 



1. PoiiPHYEA LACiNiATA, Agardh. (Plate XIX. fig. 75, 

 frond, natural size.) 



Hab. On rocks within tide-marks. Annual. 



From spring till the end of autumn ; indeed, though not 

 in abundance, it is to be found here during all the winter. 

 These winter specimens are very dark-coloured, and do not 

 adhere to paper in drying. It has been stated that owing 

 to the shrinking of the delicate fronds, this fine plant does 

 not at any time adhere well to paper ; by proper management 

 none adheres better, and the mode of effecting it we shall 

 state at the end of this volume, when giving directions for 

 p^ese^^dng Alg?c for the herbarium. In substance it is 

 very thin and membranaceous, and children call it sea-silk. 

 It varies much in colour ; the most general is the bluish- 



