220 BRITISH SEA-WEEDS. [^Rhoclospermece. 



patclies of Callithamnion Tiirneri, and with TiLhuli]}ora 

 seqiens. ATlien fresh it has a slight violet flavour. 



Genus LIV. GYMNOGONGRUS, Mart, 



Gen. Char. "Frond cylindrical, filiform, much branched. 

 Fructification, naked warts composed of strings of cruciate tetra- 

 spores. — Name from the Greek, signifying naked and a wart^ 

 in allusion to the appearance of the fruit on the branches." — 

 Harvey. , 



1. Gymnogongrus plicatus, Mart. 



Hab. On rocks in the sea. Perennial. Common. 



E,oot, a small disc ; fronds very numerous and matted 

 together ; they are horny, rigid, and thicker than a hog's 

 bristles. In some localities they are ten inches in length ; 

 ^vith us, from three to five ; in drying, they do not adhere 

 to paper. Very common on some parts of the coast of 

 Ayrshire ; much more common on the opposite islands of 

 Cumbrae, where they are found on the shore in great 

 reddish tufts. 



2. Gymnogongrus GRiFFiTHSiiE, Mart. 



Hab. On rocks at low-water mark. Perennial. "Winter 

 and autumn. Hare. It is like a miniature specimen of 



