30 THE MARINE BOTANIST. 



Ireland, and in Plymouth Sound; it is likewise a 

 native of the south of Spain and New Zealand ; 

 but is of rare occurrence in all these widely sepa- 

 rated locahties. 



LAMINARIACEiE.— LAMINARIA TRIBE. 



Sea plants of an oUve-g-reen or olive-brown 

 colour, of a membranaceous or leathery texture. 

 Fronds large, leaf-like, stalked, and cleft, or tubular 

 and divided internally by partitions arising at 

 equal distances. Fructification. Spores either form- 

 ing indefinite patches on some part of the fronds, 

 or covering the whole surface. 



The large species of Alaria and Laminaria which 

 grow in deep water along our shores, are very 

 different from aU other sea-weeds; they may at 

 once be known by their round woody stems and 

 long flat fronds. In Alaria the stem is percurrent 

 through the main frond, forming a distinct mid- 

 rib. The fructification in this genus is confined 



