Fig. 7. CYSTOSEIRA FCENICULACEA. 



Colour. When fresh^ clear^ pale olive-green ; wlien dry, black. 

 Substance. Tougli, leathery. 



Character of Frond. Shrub-like. Stem a little compressed. Branches beset 

 with rough points as if branchlets had been broken off. When young 

 and growing in deep water, furnished with long, flat, cut-out, midribbed 

 leaves, which afterwards become branches. 



Measurement. From 1 to 2 feet long; of which the stem is from 4 to 6 inches. 



Air-vessels. Inflations in the branches near the ends; small; narrow; oblong; 

 one or two together. 



Fructification. Minute seeds [spores) in special receptacles at the ends of the 

 branches, thickening them. Receptacles minute; very long. 



Habitat. South and South-west of England. Jersey. Rocks in tide-pools. 



Fig. 8. CYSTOSEIRA BARBATA. 



Colour. When fresh, reddish-brown; when dry, perfectly black. 

 Substance. Tough, leathery. 



Character of Frond. Shrub-like. Stem covered with bulbous knobs, from 

 each of which springs a branch. Branches slender, cylindrical; many 

 times divided and branched. 



Measurement. From 12 to 14 inches long. 



Air-vessels. Inflations in the upper part of the branches; one or two near 

 together; chain-like. 



Fructification. Minute seeds (spores) in special receptacles at the ends of the 

 branches, thickening them; tipped with a spine-like point. 



Habitat. The Mediterranean. Said to have found its way to our shores 

 formerly; but has not been found for half a century or more. 



The spine-like point of the receptacle distinguishes C. barhata from G. granulata, 

 with which its knob-like processes might otherwise confound it. 



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