THE MARINE BOTANIST. 19 



FUCUS MACKAIL— MACKAY'S FUCUS. 



^' Frond six to ten inches long, densely tufted • 

 branches crowded, spreading", compressed at base, 

 cylindrical upwards. Air-vessels wider than the 

 frond. Substance leathery; when dry, somewhat 

 horny." Receptacles drooping*, borne at the base 

 of the branches. Colour dull olive-green. This 

 species vegetates, unattached by any root, in land- 

 locked bays, among boulders, and on muddy sea- 

 shores. Perennial. April and May. West of 

 Ireland, Cunnemara. North and west of Scotland ; 

 Loch Seaforth, Arasaig, Loch Coul and Kyle, 

 Sutherlandshire. East coast of Skye, and head 

 of Loch Duich. 



FUCUS CAN ALICULATUS.— GROOVED, or 

 CHANNELLED FUCUS. 



Without air-vessels. Receptacles swollen, ter- 

 minal, divided into two, or in pairs. Smaller than 

 the other species, from three to six inches in 



