316 Mr George Traill on the 



93. Laminaria hyperborea (Giinn), Foslie. {L. Cloustoni (Edm.), Lb 



Jolis. L. di(jUala, Auct., partim.) 



In deep water. Perennial. Fruit in winter. 



94. Laminaria longicruris, De la Pj'I. 

 Water-worn specimens cast ashore at 8anday. 



95. Laminaria saccliarina (Linn.), Lamour. 



In pools near low-water mark, also in deep water. Sometimes 

 epiphytic on other Alga?. Always submerged. Perennial. Fruit 

 in summer and autumn. The variety caperata also occurs, usually 

 in from 3 to 10 fathoms, coral bottoms. 



95a. Laminaria saccharina, var. PhyllUis (Stack. ), Le Jolis. {Laminaria 

 Phyllitis, Lamour.) 



In pools near low-water mark, also in deep water. Rather 

 uncertain in its appearance. " Fruits without growing to a large size, 

 while small plants of Laminaria saccharina (Linn.), Lamour, grow- 

 ing along with it do not" (M'Bain). Annual. Spring and summer. 



Order V.— FUCOIDE^. 



Family.— FUCACE/E. 



HALIDRYS, Lyngb. 



96. Halidrys siliquosa (Linn.), Lyngb. 



Common in pools at and below half-tide level. Always sub- 

 merged. Large plants in deep water. Perennial. Fruit in winter. 

 Spores escape in April from the plants growing between tide marks. 



FUCUS, Linn. 



97. Fucus ceranoides, Linn. 



(Jn rocks and stones between tide marks ; usually where fresh- 

 Avater streams enter the sea, often in land-locked bays and estuaries. 

 Always submerged. Perennial. Fruit in spring and summer. 

 Papa-Westray ; Loch of Stenness, where a very narrow form 

 occurs. 



98. Fucus vesiculosus, Linn. 



Common on rocks between tide marks, and left uncovered by the 

 tide and exposed to the light for some hours daily. Perennial. 

 Fruit in winter and summer. 



99. Fucus platycarpus, Tluiict. 



Common on rocks from near high-water mark to about half-tide 

 level, and occasionally at a lower level. Usually left uncovered 

 by the tide in shaded places for several hours daily. Perennial. 

 Sporangia all the year. Spores escape in August. 



100. Fucus serratus, Linn. 



Common on rocks at about half-tide level. Usually left 

 imcovered by the tide, and exposed to the light for some hours 



