244 BRITISH SEA-WEEDS. 



tangled fibres, growing several together but distinct from 

 each other, about half an inch high, erect, simple, cylindrical, 

 their axis composed of branched, interwoven, irregular 

 fibres, which throw off to the circumference club-shaped 

 filaments of the same nature, and nearly of the same form 

 as those of C. tomentosum. 



This minute and very singular plant was discovered 

 by Mr. M'Calla, in 1843, on turf-banks, at extreme 

 high-water mark, near Roundstone, Galway, where it 

 was exposed alternately to the influence of salt and fresh 

 water, and occasionally to the absence of both. 



Codium adhserens. The adhering Codiuxn. 



Frond spreading over rocks in irregular patches, from 

 one to two feet or more in diameter, composed of a layer 

 of entangled, interwoven, cylindrical fibres, from which issue 

 linear, club-shaped, vertical filaments ; these are all of equal 

 length, and resemble in arrangement and appearance the 

 pile of velvet. 



This species grows near low- water mark. It is peren- 

 nial, and in perfection in summer. When wet it is of a 

 brilliant green colour, and its soft gelatinous texture 

 causes it to adhere closely to paper. 



Genus CV. VAUCHERIA. 



Fronds tufted, interwoven ; each consisting of a single, 

 branched, one-celled, delicate, cylindrical filament, filled 

 with granular endochrome. Fructification, zoospores con- 

 tained in sporangia attached to the sides of the branches 

 and accompanied by hooked cylindrical antheridia. — Vatt- 



