252 BRITISH SEA-WEEDS. 



to the equator, they penetrate inland, and may be found 

 in rivers, brooks, and even ditches. 



Enteromorpha cornu-copise. The cornu-copise 

 Enteromorpha. 



Fronds about an inch high, stalked, tubular, of very small 

 diameter at the base, becoming suddenly wider above, and 

 eventually bursting into a miniature goblet, usually para- 

 sitic on Coi^aJlincB, etc. Fructification dispersed throughout 

 the frond. 



I have hesitated to degrade this plant to the rank of 

 a variety, as it has been admitted as a species by authors 

 who have had better opportunities to study it than I 

 have. At the same time, I am inclined to agree with 

 those botanists who regard it as only a worn state of a 

 stunted form of E. intestinalis. 



Enteromorpha intestinalis. The intestine Entero- 

 morpha. 



Frond a simple, elongate, membranous sac, taper at the 

 base, obtuse at the tip, and of very variable length and dia- 

 meter. Fructification in the cells of the membrane of 

 which the frond is composed. 



This plant is found on all parts of our coasts, in tidal 

 and other rivers, in canals, and even in ditches. It ap- 

 pears to grow indifferently in salt and fresh water, and 

 to attain the greatest luxuriance in situations where the 

 two mingle. The fronds vary considerably in size, both 

 in length and breadth. They are occasionally constrict- 

 ed or crisped, and their inflation is more or less irre- 

 gular. With these exceptions the character of the plant 

 is very constant, and its specific identity may be always 



