THE MARINE BOTANIST. 7 



moved from the Chordariaceae. Among the Ecto- 

 carpus tribe are classed the simplest in organization 

 of the oUve-coloured sea-weeds , they are arranged 

 into two sub-orders; in the one are placed those 

 genera whose fronds are rigid, and in wliich the 

 articulation is composed of several cells, and in 

 the other, those with flaccid fi^onds and single- 

 celled articulations. 



FUCACEiE.— THE FUCUS TEIBE. 



" Olive-coloured, inarticulate sea-weeds, whose 

 spores are contained in spherical cavities immersed 

 in the surface of the frond." 



In these plants the receptacles containing the 

 seed cavities usually form distinct portions of the 

 frond : in the Fuci, they are large, and placed a 

 the tips of the fronds ; their surface is pierced by 

 minute pores which communicate with the con- 

 ceptacles ; these contain either spores or antheridia, 

 or both together; the former are supposed to be 

 analogous with the seeds of more perfect plants, 

 while the latter represent the stamens ; they consist 



