Fuce(E?[ rucus. 113 



of sea- whistles, in consequence of the custom which chihh-en 

 have of converting the vesicles into whistles. The vesicles 

 serve to buoy up the plant amidst the waves. It is of an 

 olive-green colour; the receptacles are yellow; but the 

 whole plant becomes black in drying, and does not adhere 

 to paper. The air-vessels are called crackers', and when 

 cast into the fire, they soon show that they deserve the name 

 by a startling explosion when heated. 



Hab. Sea-shores. Common. Perennial. Winter and spring. 



5. Pucus Mackaii, Turn. This was so named by Mr. 

 Turner in honour of my worthy friend. Dr. J. T. Mackay, 

 of Dublin, whose botanical discoveries have been numerous 

 and valuable. It is found in Connemara, and also in the 

 west of Scotland ; but I have never fallen in with it, and it 

 is known to me only by dried specimens. 



6. Fucus CANALTCULATUS, Linn. Channelled Fuciis. 

 This is abundant on rocks on the sea-shore, near high-water 

 mark. Perennial. Summer and winter. " Cattle are ex- 

 ceedingly fond of this plant, and never fail to browze on it 

 in winter, as soon as the tide leaves It within their reach. 

 At this season it is peculiarly wholesome as counteracting 

 the costiveness induced by their ordinary straw-commons." 

 — Carmichael, in Sir W. J. Hooker's British Plora. 



I 



