Sjntopsis jrf Seated* Cribs, 



They are divided into three great classes — The Olive- 

 The Red — The Green Seaweeds. 



OLIVE GEEEX, OE MELANOSPEEMEJE. 



(Marine plants of an olive green or olive brown colour.) 



Fructification. — Monxcious or disecious. Spores either ex- 

 ternal or contained, singly or in groups, in proper conceptacles. 

 Antheridia (transparent cells) with active small bodies moving 

 by means of vibratile hairs or cilia. 



C Seaweeds of an olive brown or blackish-green colour, 



1 < Fucacex. 



(. Seaweeds of an olive green or yellowish-green colour. 



q ("Fronds membranaceous, inarticulate. 

 " {^Fronds articulate. 



("Spores external, borne on jointed filaments, 



Sporochnacex. 

 Spores on the surface of the frond. 



C Spores covering the whole of the frond, or in ill-defined 



. \ patches Laminariacese. 



j Spores grouped together in well-defined spots or lines, 

 V. Dictyotacex. 



f Fronds composed of articulate filaments interlaced toge- 



5 < ther. Spores immersed Chordariacex. 



(.Fronds filiform, jointed. Spores external. Ectocarpacex. 



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